The teenager in the house has been playing a lot of Portal 2 co-op with friends elsewhere. It seems to come with a lot of accompanying loud chatter. On consideration I think Portal 2 chatter is less obnoxious than Team Fortress 2 chatter.
I think this may be a function of "teenager", not Portal 2. The loudest C and I get is me saying "don't drop me in the lava" and her laughing. Most of the conversation seems to be along the lines of "hmmmm". :-)
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