Part of the reason I can't is that I have a big mole almost blocking one of my ears, so I don't think that I could get a pair cast to fit around that. Plus my outer ear canals are incredibly irritable and get infected if I look funny at them. I can't put anything in my ears without them getting sore; earplugs or in-ear headphones or anything like that. It's really annoying, because I don't *like* over-noisy clubs.