Bonita knocked my violin case (with violin inside it) off the bookshelf tonight. She knew I was pissed and streaked across the apartment to hide in the bathroom. I took off after her and found her ready for me, growling and hissing and two times her normal size. I couldn't pick her up (too many fangs and back claws), so I just leaned down and hissed right back at her. We went back and forth like that for about 10 seconds, until both of us cooled off a bit.
On the one hand, it was totally appropriate. On the other hand, I need to get out more.