While trimming Gizmo's nails, he gave a little kick, and for the first time ever I nipped the quick while cutting them. It wasn't a bad cut (didn't even bleed), but he still started making his little sobbing noises and I felt awful.
It was on the first foot I was trimming, so I figured the rest of them were probably going to be a huge fight now that Gizmo realized that nail trimming could hurt, but he was actually surprisingly cooperative about the whole thing.
In other news, Gizmo has been shedding like crazy. I swear I've been grooming a chinchilla worth of hair off of him every day.