I was watching two of my 2 week old panther chameleons doing a face off on one particular branch. The one on the bottom wouldn’t let the upper one pass. Next thing I see is the one on top nails the other one on the head with his tongue and knocks it off the branch. I wish I had filmed it. It was hilarious, except for the little guy that got nailed. I separated them after that so that there wouldn’t be any drive-by zapping incidents’ after that.