Ah yes, claws. I catch mine fairly often. It's impossible for me to put on a sweater without getting them hooked in, and I often find holes in my shirts or pants from them.
I've also accidentally hurt one of my friends with them. She was chasing me and ended up tackling me. I panicked and ended up raking my claws down her arm. Then I realized it was her. I still didn't think she would have been able to feel the pain, but she looked at her arm in shock because she had scratches running down it.

I looked down at my claws and saw that they did indeed have her blood on them. I'm never going to forget that moment because it was when I seriously began considering myself an otherkin. I've been much more careful with my wings and claws since. Of course I occasionally forget. I've gotten stuck in a doorway once.