Collections other than games?

I know a lot of people here collect video games but anybody collect anything else? Since I count a lot of money every night at the end of work I've started collecting pennies. I used to as a little kid so my parents could keep me occupied when they were working and recently I found my old books of pennies and have started adding to them. I got inspired when I found a penny from 1914 in the cash register, I just think it's so cool to find something that's almost 100 years old. Anyway, I'm not really hardcore about it or anything, and I don't go out and buy pennies (haha), It's just a fun hobby to keep myself slightly more sane at work.

Anyway, I'd love to hear about some things you guys collect.

Karate belts!! Everytime I earn one I buy another the same colour with my name stitched on the end.

I enjoy having films I like in DVD/tape for the same reason as games, a sort of physical collectible claim over what boils down to something you experience over a relatively short period of time.

I also have a good selection of books and records, although with no particular theme other than my personal taste running through it.

I have a cousin who collects anything with owls, particularly small statuettes. It's madness, she has hundreds of them.