A bizarre thing I've seen is this group of like 20 or so dudes at Epcot theme park who obviously had several beverages, and they just started hitting everyone in their party for no apparent reason, they were punching, smacking, shoving, kicking, even head butting each other, and a few of them even started rolling on the ground. A custodial CM looked at them as if they were nuts, and so did everyone else. They weren't even fighting, it was just trying to get hurt for fun I guess. This took place in the area between France and the international gateway. What a bunch of weirdoes.
As a CM I've also seen people go to the toppings bar at Cosmic's, get a plateful of mushrooms and put ketchup all over them then proceed to eat it with a fork. We also had the colored mayonnaise at that time and some kids decided to smear each other on the face as if it was a war paint or something.
Finally, the weirdest which takes the cake in my opinion would be when we were at the MK gate and I noticed some dude who was walking kind of weird as if there is something troubling him between his legs. When he entered MK he walked to where his family was and in clear view of everyone he then put down his shorts and took out a Subway sub which he was trying to sneak in. And then from his shorts pockets he then took out a couple more sandwiches. Why he had to sneak this in, I have no idea! Weirdo!