Pros
Most of the people with whom you work.
Cons
Far,far too many grade-school activites like decorating your workspaces, dressing up in costumes, making signs etc. Makes you feel like you are in kindergarten or grade school. These "team-building" activities are too frequent, tiring and you feel pressured to participate or get labeled as a "bad" team mate. There are committees just dreaming up this stuff to "have fun", but it takes away from productivity and is a bother to many, as are the frequent demands to participate in "potlucks", which means you have to make or buy something for everyone to eat. For freindly, but more mature people like me all of this stuff hurts my morale, and I feel put upon. I just want to come to work, do my work and enjoy my team mates' personalities. Don't need or want all this "forced fun."