We had a near 2 band brawl when we were doing tour dates on a decently famous R&B singer's mini tour. She got cut off "early" [because she started late] then threw a tirade on her way out knocking over mic stands and stools. He manager then threw one of my wireless Beltpacks so far/well into the flyrail area we never did find it. Police escorted the managers of the two feuding bands out of the arena. That junk was crazy. I hope to never have that type of crap happen on stage again.
I put the pieces together and realized that situation was more of a long standing feud between the two act's PM's, but wow, so crazy