Apparently, animals; the Manflesh has said we cannot have any more creatures in the household and is holding the line at three dogs and a snake (at one time, we had two snakes, two rats (doggie tv!), three dogs, and three cats. He said that is Too Many). Anything bat-related (you know how some people collect cows or geese or pigs? I am like that, but with bats).
For a long time, it was funky socks and wigs, but I seem to have finally gotten out of that. At this juncture in my life, I'd have to say denim (27 pairs) and shoes/ boots (clocking in at a weirdly wearable 121 pairs - I will wear up to three pairs a day, depending on my activities, so they get worn more often that I would've suspected if I didn't track the wear).