Tom Cruise was doing interviews with reporters today, and one of them had a fake microphone which was a squirt gun. Tom got wet! He gave the guy an earful for a while, but no violence was exchanged. The guy and two of his acquaintances were arrested!

http://www.ktvu.com/entertainment/4628281/detail.html

When I googled for it, I found a few quotes of guys that suggested filling a squirt-gun with ammonia, and using it. I'd bet that Tom was freaking out!!!