Anything I don't use I sell, give to charity, or trash. I do have books, movies, etc. but unless I will be reading a book over again I give it to the library and I borrow a lot books from them too instead of buying. I'm 26 and still have clothes from high school if that tells you anything about my fashion cares.
I think it's cool to check out these threads where people have like 30 bikes and parts everywhere but to own more than one bike would drive me crazy. Ok, actually I have a bmx bike too but that's for sale, so there.
