Q: "11 people, but just once...man, 30 people?!?!?!"
Yep, the good ol' D&D club. When they first announced the club we figured there'd be at most 10 people show up...nope (and after I left the group surged to 50 members and had 3 tables going at once, all in a school with only 350 students). The thing about running this group was that you couldn't mess around with any NPC (in game) talking, and assigned callers were a must (it would be impossible to deal with that many people talking at once). Also, the other biggy was the time it took to deal with battles (just passing the dice). So, it probably was a pretty crappy experiance for the newer players not getting to experiance what the game was all about.