There's an old joke about a cop who's walking his beat in the middle of the night, and he comes across a guy under a street lamp who's looking at the ground and moving from side to side, and the cop asks him what he's doing.
Znáte ten vtip o poldovi, co je na pochůzce uprostřed noci a najednou narazí na chlápka  pod pouliční lampou, který se dívá na zem a houpe se  ze strany na stranu. A ten polda se ho zeptá, co dělá.