If you don't succeed...
If at first you don't succeed, destroy all evidence that you tried.
A clear conscience is usually the sign of a bad memory.
To rob a bank
A naked women robs a bank. Nobody could remember her face.
A child's observation
A child's observation: If my mother laughs at dad's jokes, we have guests.
I like to play chess with old men
I like to play chess with old men in the park, although it's hard to find 32 of them.