GREAT MOMENTS IN UNCIVIL LITIGATION: A practice pointer from from the ALOTT5MA legal staff -- if you're taking a deposition and you disapprove of opposing counsel's tactics, you should find a way to rebut such conduct other than saying to the offending lawyer "I'll f*cking kick your ass. I'll do it right here in front of all these attorneys, okay?", no matter how badly it's going.
Especially if you're still on the record. (PDF of motion for sanctions, deposition)
I have confirmation, fyi, that this is real and legitimate.