I haven't ever gotten nipped on the butt, just bonked occasionally.
Mum, however, has gotten nipped on the cheeks by Storm and the butt-bruise was there for a whole week. What's more, mum did noting in particular to offend him. Besides unintentionally squatting in his way whilst trying to grab some clean linen.
NHMBE gotten into plaves they shouldn't be in? Storm once went to explore one of our chimney vents and backtracked, emerging with a face full of soot.