I like the one where you put a dime under a quarter in a shot glass and bet you can get the dime out without touching the glass.
You blow into it, and quarter turns sideways and the dime slips up past the quarter.
I’ve lost the one about tying a cherrystem in your mouth, but the guy confessed he had a second one pre-knotted and hidden behind his gums.
The Bar Bet
The local bar was so sure that its bartender was the strongest man
around that they offered a standing $1000 bet.
The bartender would squeeze a lemon until all the juice ran into a
glass, and hand the lemon to a patron. Anyone who could squeeze one
more drop of juice out would win the money.
Many people had tried over time ( weightlifters, longshoremen,
etc.) but nobody could do it.
One day this scrawny little man came in, wearing thick glasses and
a polyester suit, and said in a tiny, squeaky voice," I’d like to try
the bet."
After the laughter had died down, the bartender said OK, grabbed a
lemon, and squeezed away. Then he handed the wrinkled remains of the
rind to the little man.
But the crowd’s laughter turned to total silence as the man
clenched his fist around the lemon and six drops fell into the glass.
As the crowd cheered, the bartender payed the $1000, and asked the
little man," what do you do for a living? Are you a lumberjack, a
weightlifter, or what?"
The man replied," I work for the IRS."
One way to lift the bottle is to bend the straw about two inches from one end. Insert the “V” shaped point formed into the mouth of the bottle until the straw can unfold. When you lift, the now unfolded portion will wedge in the body of the bottle below the neck (see illustration.) You can try this one for yourself easily- but practice with an empty bottle first. Some light weight or paper straws may not have the rigidity necessary to keep from collapsing under the weight of the bottle plus six ounces of liquid.
An alternate solution proposed by visitors is to bend the straw into a U-shape, going around the tip of your index finder. Wedge your finger into the top of the bottle, making sure the straw comes between your finger and the bottle on both sides. We haven’t tested this experimentally, so it may be difficult depending on the width of the straw to make sure no part of your finger touches the inside of the neck.
Another proposed solution, albeit a contrived one, is to insert the straw into the beer and then lower the ambient temperature of the bar to below the freezing point of the beer (which depends on the alcohol content). Probably not easy unless the bar is in McMurdo Base, Antarctica.
I like the one where you bet your friend 1000 dollars that you can piss all over the bar and the bartender will not get pissed. In fact, he will be happy.
Then you go piss all over the bar and bottles and everything. When your friend sees how happy the bartender is, he has to pay up!!
The secret is that you have to make a 500 dollar bet with the bartender that you can be in a shot glass 5 yards away, without spilling a drop. When you piss all over everything, the bartender is happy because he just won 500 bucks!!
You go home 500 dollars richer 
No pun intended. Let’s make that:
…piss all over the bar and the bartender will not get angry…
Ask em who wrote Surfin USA …get’s em every time !!!
Lyrics - Bryan Wilson
Music - Chuck Berry (it’s “Sweet Little Sixteen”)
Got an old Chuck Berry live lp (late 60’s) that he does SLS on and the track listings say “Surfing USA”
Just to brag, I can pull off the cherrystem trick as long it’s not incredibly short. If you get a stem that’s long enough, it’s even possible to get two knots in it, though I’ve never managed three.
-ellis
That seems like a very silly bet. And what does it have to do with peeing over the bar? 
When a cute guy gets a fresh beer, I’ll bet him a quarter I can drink it without touching the glass in any way.
Then, I just pick it up and drink, and pay the quarter.
I say that’s the best 25¢ drink I’ve ever had.
A lot less suggestive than just asking a guy to buy you a drink.
My favorite bar bet is that I can drop a paper match onto the bar and it will land on edge. You just bend it to about a 90 degree angle before you drop it. I’ve never had it fail me.