All of these hustles are called a proposition Bet. Basically, a proposition bet is a challenge which looks like it only has one outcome...and it does...it always favors the person placing the wager.
That's because you know something the other folks don't. You know the 'challenge' is always going to go your way.
A show in Britain called "The Real Hustle' does these bets often as a way to show you how much fun they can be, and also how to avoid getting caught out by them. So, here we go. My Top 5 free drink hustles, in no particular order.
One: - The Magic Whiskey Trick
Two: - Keep It Under Your Hat
Three" - Carbon Copy
Four: - Measuring Up
This one is Tough. Watch first!
Just remember that MATH is a four letter word!