Whenever somebody is in the porta potty go around it and make sure the person inside can hear you and say something like "We should tip it over." and then have a friend be like "Okay." Then run into the side really fast and it will scare the shit out of them. I've done this a couple of times and one time some fat ass was in there and he came out with his pants still down and since the porta potty was next to a baseball game everybody saw him.
lolcats are ketchup packets compared to this.