I used to collect wizards. Figures, artwork, whatever. Had several dozen pieces, but then I moved, got married, had kids, bought a house, and it was just too, well, nerdy. My last leftover from Dungeons & Dragons days is in my garage, and I haven't seen it for a long time.
I used to collect some souvenir from every trial I had as well. I defended the Hard Rock Hotel in Las Vegas at the same time Playboy did a pictorial on "girls of..." and convinced their Risk Manager to autograph the cover for me and framed it. Left that job and the boss took it. (I swear that man is a zombie.) I did have quite a memory collection at one time, but I'm too cynical about the legal system now to keep it going.
Now I just collect grey hair.
Papa