On my way from home to work I saw this gem:
A flyer saying "Laptop stolen from car, reward offered". To be of any use, I think it should have said something about the reward, which must be above the [black] market value of that laptop. Can you imagine the thief contacting the owner with an innocent face: "I found this laptop in a thrash can in the park" ?
To make the gem complete, the flyer is glued on a phone booth with the inscription "displaying forbidden".