Living in your own little world WK, thought I expect it's nice in there
Eh, books, sex, work, pets, weather, news, politics, movies, food, holidays are coming up, etc.
Plans for the future, tips and tricks you picked up while working/doing your hobby-stuff, ...
I'm gonna go with "whatever pops in my head, it's nice to be able to talk and straighten stuff out in your head while doing it".
I suppose I use my friends like other people use a psychiatrist?