I had a friend in undergrad who would gamble on Friday nights (poker, at the casino, if I remember right). Gamble, but not drink. I would bug him sometimes abou

I had a friend in undergrad who would gamble on Friday nights (poker, at the casino, if I remember right). Gamble, but not drink. I would bug him sometimes about the money he was throwing away. Then one day he said "Tony, you know what the difference is between my Friday night [at the casino] and your Friday night [at the bar]? There's some probability that I'll have more money at the end of the night than I started with." And I quit bugging him!