Did somebody say collections? If I have something longer than five minutes, I become attached to it. I would say that most everything I collect either has senitmental, monetary, or research value to me.
There are, of course, the books...something like six thousand (estimate)
I also have a burgeoning bookmark collection...a very cheap hobby, as I collect them from almost every bookstore I go into...I say only a few are rare.
I have theatre programmes, I suspect, from almost every show I ever saw.
I have boxes of magazines...PLAYBOYS back from the sixties, old movie mags, play mags (A lot of Theatre Arts), Show magazine...
I have boxes and stacks of comic books that go back to the Silver Age and some even from the fifties (Talk about no monetary value, when I was a kid I tore the covers off my Tarzan comics to tack to my wall...so I have a stack of coverless Tarzans).
I stopped adding to my walking stick collection sometime ago. I have a very small, but odd collection of buttons, I have baseball cards dating from the seventies (I wish I still had the ones I collected in the fifties), I have boxes and boxes of personal memorabilia...clippings and all kinds of crap from my writing career, acting career, and high school stuff). I have a ton of vinyl, including 78s. Rolls of my posters from my own movies (one of these days I'll sit at the Courts show and charge an outrageous to sign them).
I have files and boxes of every working draft, every outline, every note I jotted down on a napkin or scrap of paper from my film and play scripts. I expect these will eventually be donated to my alma mater or whoever wants them.
I also have a couple of boxes of class notebooks and papers from high school and college. I recently went through this and chucked a lot of it out...I'll never need Algebra notes again. But a lot of them I just kept because along with my notes were tons of doodles and sketches I had done.
Perhaps the most useless collection that my wife and I share is the hoard of greeting cards that we have given each other over the years for the various holidays and special occasions. We have tried to do some winnowing of them in the last few years, but some of them are just hysterically funny or the sentiments and jokes we've written in them are just something that we can't part with...So they sit in boxes crammed in closets like the little firetraps they are...