A physicist, a mathematician and a computer scientist discuss what is better: a wife or a girlfriend.
The physicist: “A girlfriend. You still have freedom to experiment. “
The mathematician: “A wife. You have security. “
The computer scientist: “Both. When I’m not with my wife, she thinks I’m with my girlfriend. With my girlfriend it’s vice versa. Then I can be with my computer without anyone disturbing me. “
This joke is included in the Black Book of Jokes. You can order it from here.