I went to a small airshow near Dallas years ago. A great, big Huey came in for a demonstration. A Port-a-potty caught the backwash and tumbled end over end across the field. Poor fellow inside......
(Not actually a prank, but same level of humor.)
He got off lite. About 5 years ago there was a port-a-potty accident at one of the facilities my department was putting together. The office park wasn't quite completed, so there were no suite numbers on the office buildings. An 18 wheeler stopped to drop off some equipment and had to go inside one of the offices to get directions. The driver didn't put his parking brake on correctly and while he was inside, the truck rolled backward, knocked over and then rolled over part of a port-a-potty...with somebody still in it. He lived, but spent a couple days in the hospital. Getting run over by a tractor-trailer is bad enough, but in the process to end up covered in everyone elses...well, you get the picture.