I've been riding MUNI for 25 years. The only assault I saw was a drunk office worker on his way home on the 31AX.
The funniest (or not if you’re not from SF) was a guy boarding a full bus with a 7 foot long dining table with the legs attached, arguing and threatening anyone who protested. Eventually he dropped the thing on someone’s foot and starting an altercation which delayed everyone by 15 mins.