I'd play low stakes (.10/.20) Texas Hold'em, but that's not a casino game, per se.
Either that, or I'd take dares...
There's this old story about a Russian guy back when the KGB was in on everything.
Sasha is approached at his office by a KGB agent who says "You have much more money than you could be making at your job."
Sasha replies that he makes his living on bets.
The KGB man says "show me"
Sasha says: I bet you 20 rubles that I can bite my eye
The KGB man agrees, figuring no one can bite his own eye.
Sasha takes out his glass eye and bites it.
The KGB agent reluctantly gives him 20 rubles.
Sasha says "I bet you double or nothing that I can bite my other eye"
The agent sees Sasha isn't blind, so he puts 40 rubles on the desk,
Sasha removes his false teeth, and uses them to bite his other eye.
The agent says "but this is all small potatoes. How do you make so much money?"
"Step outside into the street and I'll show you" says Sasha. The agent steps outside. "Take off your boot." The agent takes off his boot. "I bet you 500 rubles that I can pee into your boot and your boot will be completely dry and smell like a rose."
The agent is sure that Sasha will lose this bet, so he agrees.
Sasha pees into the boot, and sure enough, it's wet and smells like urine.
He sheepishly hands the agent 500 rubles.
The agent says "I don't understand - how can you make money this way?"
Sasha points across the street at a man in an upstairs window and says
"See that man over there? I bet him 1000 rubles that I could pee in your boot and not only you wouldn't have me killed, you'd be happy about it."