The Budos Band - Black Venom
The Budos Band are awesome. Seeing them live was one of the best decisions I've made on this Earth.
Mid encore, the bass player (picture of his battle stance attached below) and the keyboard player started having a straight up fight. I'm talking middle of a song. Pushing, punches, aggressive swear words, everything - and they kept playing while all this was going on, not missing a beat.
I still wonder whether it was staged or not.