Arnold Schwarzenegger isn't a guy that can go easily unnoticed in public, unless he happens to be in a wax museum. To promote Terminator Genesis, Arnold went undercover as one of the figurines at Hollywood's Madame Tussauds wax museum and waited for the perfect moment to come to life and scare unsuspecting tourists. 

I guess if you're going to piss your pants in public, at least you have a cool story to tell people that the Terminator is the reason for it.