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Playing friendly in tf2 can be immensly fun, though. It's the social interaction thingy, and lots of weird funny shit happening. Plus it can be a nice break from a serious game.
I don't know why, but I've been making myself somewhat guilty of this malpractice of not playing the game, lately.
I'd just go soldier with the rocket jumper, and jump to some high place or vantage point, and just watch other people do their thing, wich is pretty funny sometimes.