Coin on a sidewalk
If there is evil hiding somewhere deep inside of you, rejoice. Here is one great tip on how to ruin if not a day than at least a half an hour for random passers by. Coin on a sidewalk prank takes some pretty sophisticated preparations, but it’ totally worth it.
Here is some guy from Sweden. He welded a 5 Swedish Kronor coin (you can use any coin you like, actually) to a nail, polished the top side of the coin and drove the nail deep into the pavement making coin absolutely impossible to pick up. Hilarity ensued.