I used to be a game developer at EA Tiburon, the studio that does Madden among other games. Somehow I got roped into giving a short talk to a bunch of visiting high school students.
Beforehand I emailed a bunch of game teams and asked them to send me screenshots of their weirdest bugs. I got all sorts of fun stuff. When a game with rendered animated humans goes wrong, it can look anywhere from funhouse hilarious to horror film insane. Giant players dwarfing the field. Players with their eyes sticking out a foot in front of their head. Arms on backwards.
The kids loved it. Heck, I loved it. It was a ton of fun.