A Rare Crackening
A rare crackening is when your claws split open like a bad pizza crust. It's not rare because it happens a lot, but it's rare because it happens to you every time.
My claws cracked during a video game battle because I was too angry at my brother.
She had a rare crackening during a dance battle because she was too competitive.
I cracked my claws during a math test because I was too mad about the problem.