The only time I kicked anyone out of a group I later realised it was probably a slight over-reaction on my part
I've haven't had many problems in groups that I manage/help manage. I suppose you could get the odd troll wander through though 
I found moderation a fun novelty at first but it wears off and then its just a job. But a cool job. 
Hey guys,
I'm new to the whole group administration thing but I have to say that the ability to ban/delete/control the messages is pretty titilating... I hope to never have to use it, of course, but isn't it neat that it's there? Kindof thrilling.
I was curious if any of you have ever had to ban anyone from your groups so far. If so, what was their offense? How did your group take it?
Being a group moderator is a cool responsibility. I have high hopes that everyone in my group will stay super classy.