,
This story is a very famous satirical piece by Mark Twain. It's set in a gold-mining camp in California and has its origins in the folklore of the Gold Rush era. It's frequently cited as an example of a tall tale, noting Twain’s use of humor and exaggeration. At the time it was written, it was a clever way to introduce readers in the eastern part of the country to tales from the mining camps. Its extensive use of dialog brings the reader right inside the telling of the tale as it would have been told in a tavern or around a campfire. In the story, Jim Smiley would bet on anything if he could get someone to bet against him, and he almost always won the bet. He often used ordinary or unnoticeable animals to win his bets, underdogs that came back and won at the last minute.
At the request of a friend of mine, who wrote me from the East, I called on good-natured, garrulous old Simon Wheeler, and inquired after my friend’s friend, Leonidas W. Smiley, as requested to do. I have a lurking suspicion that Leonidas W. Smiley is a myth; that my friend never knew such a personage; and that he only conjectured that, if I asked old Wheeler about him, it would remind him of his infamous Jim Smiley, and he would go to work and bore me nearly to death with some infernal reminiscence of him as long and tedious as it should be useless to me. If that was the design, it certainly succeeded.
…Well, thish-yer Smiley had rat-tarriers, and chicken cocks, and tomcats, and all them kind of things, till you couldn’t rest, and you couldn’t fetch nothing for him to bet on but he’d match you. He ketched a frog one day, and took him home, and said he cal’klated to edercate him. And so he never done nothing for three months but set in his back yard and learn that frog to jump. And you bet you he did learn him, too. He’d give him a little punch behind, and the next minute you’d see that frog whirling in the air like a doughnut — see him turn one summerset, or maybe a couple, if he got a good start, and come down flat-footed and all right, like a cat. He got him up so in the matter of catching flies, and kept him in practice so constant, that he’d nail a fly every time as far as he could see him. Smiley said all a frog wanted was education, and he could do most anything — and I believe him. Why, I’ve seen him set Dan’l Webster down here on this floor — Dan’l Webster was the name of the frog — and sing out, “Flies, Dan’l, flies!” and quicker’n you could wink, he’d spring straight up, and snake a fly off’n the counter there, and flop down on the floor again as solid as a gob of mud, and fall to scratching the side of his head with his hind foot as indifferent as if he hadn’t no idea he’d been doin’ any more’n any frog might do. You never see a frog so modest and straightforward as he was, for all he was so gifted. And when it come to fair and square jumping on a dead level, he could get over more ground at one straddle than any animal of his breed you ever see. Jumping on a dead level was his strong suit, you understand; and when it come to that, Smiley would ante up money on him as long as he had a red. Smiley was monstrous proud of that frog, and well he might be, for fellers that had traveled and been everywheres, all said he laid over any frog that ever they see.
Well, Smiley kept the beast in a little box, and he used to fetch him downtown sometimes and lay for a bet. One day a feller — a stranger in the camp, he was — come across him with his box, and says:
“What might it be that you’ve got in the box?”
And Smiley says, sorter indifferent like, “It might be a parrot, or it might be a canary, maybe, but it an’t — it’s only just a frog.”
And the feller took it and looked at it careful, and turned it round this way and that, and says, “H’m — so ’tis. Well, what’s he good for?”
“Well,” Smiley says, easy and careless, “He’s good enough for one thing, I should judge — he can outjump any frog in Calaveras County.”
The feller took the box again, and took another long, particular look, and give it back to Smiley, and says, very deliberate, “Well, I don’t see no p’ints about that frog that’s any better’n any other frog.”
“Maybe you don’t,” Smiley says. “Maybe you understand frogs, and maybe you don’t understand ’em. Maybe you’ve had experience, and maybe you an’t only a amature, as it were. Anyways, I’ve got my opinion, and I’ll risk forty dollars that he can outjump any frog in Calaveras County.”
And the feller studied a minute, and then says, kinder sad like, “Well, I’m only a stranger here, and I ain’t got no frog; but if I had a frog, I’d bet you.”
And then Smiley says, “That’s all right — that’s all right — if you’ll hold my box a minute, I’ll go and get you a frog.” And so the feller took the box, and put up his forty dollars along with Smiley’s, and set down to wait.
So he set there a good while thinking and thinking to hisself. Then he got the frog out and prized his mouth open and took a teaspoon and filled him full of quail shot — filled him pretty near up to his chin — and set him on the floor. Smiley he went to the swamp and slopped around in the mud for a long time. Finally he ketched a frog, and fetched him in, and give him to this feller, and says:
“Now, if you’re ready, set him alongside of Dan’l, with his forepaws just even with Dan’l, and I’ll give the word.” Then he says, “One — two — three — jump!” and him and the feller touched up the frogs from behind. The new frog hopped off, but Dan’l give a heave, and hysted up his shoulders — so — like a Frenchman, but it wan’t no use. He couldn’t budge. He was planted as solid as an anvil, and he couldn’t no more stir than if he was anchored out. Smiley was a good deal surprised, and he was disgusted too, but he didn’t have no idea what the matter was, of course.

The feller took the money and started away; and when he was going out at the door, he sorter jerked his thumb over his shoulders — this way — at Dan’l, and says again, very deliberate, “Well, I don’t see no p’ints about that frog that’s any better’n any other frog.”
Smiley he stood scratching his head and looking down at Dan’l a long time. At last he says, “I do wonder what in the nation that frog throw’d off for — I wonder if there an’t something the matter with him — he ’pears to look mighty baggy, somehow.” And he ketched Dan’l by the nap of the neck, and lifted him up and says, “Why, blame my cats, if he don’t weigh five pound!” He turned him upside down, and he belched out a double handful of shot. And then he saw how it was, and he was the maddest man — he set the frog down and took out after that feller, but he never ketched him. And—
[Here Simon Wheeler heard his name called from the front yard and got up to see what was wanted.] And turning to me as he moved away, he said, “Just set where you are, stranger, and rest easy — I ain’t going to be gone a second.”
But, by your leave, I did not think that a continuation of the history of the enterprising vagabond Jim Smiley would be likely to afford me much information concerning the Rev. Leonidas W. Smiley, and so I started away.
At the door I met the sociable Wheeler returning, and he buttonholed me and recommenced:
“Well, thish-yer Smiley had a yaller one-eyed cow that didn’t have no tail, only jest a short stump like a bannanner, and—”
“Oh, hang Smiley and his afflicted cow!” I muttered, good-naturedly, and bidding the old gentleman good-day, I departed.