go to the streets and hand out trophies to people for whatever reasons and make the trophies out of very strong magnets
dress guy in straight jacket and other guys are watching him leach him to something he brakes free than he gets lose and chases people or grabs a guy in on the prank and chases him also make him bark like a dog. or make him drive away or run away and the guys that are watching him will say loudly oh crap we let that killer go and make them overreact so i scares people.
this one is really bad have someone walk around and have a backpack and inside the backpack or suitcase is a recorder that is a kid saying help me when you set it down like open it than when people try and open it the guy grabs his bag and runs or make it make noises and the guy punches it and whispers like shut up or else. no or is wee man and he unzips and he is dressed as a girl and when he sets the bag down we man calls people over and says help he has kidnapped me