Walk around having a conversation, and wait to find someone wearing a suit holding a briefcase. Backhand your friend in the chest, and say, "HOLD UP, ain't that the guy?" While pointing at the guy in the suit, say "That's him! That's the guy! THAT'S THE FUCKIN' GUY!" and start walking toward him.
If the guy starts backing away, start sprinting full blast, and you'll see that most of the time the guy in the suit runs like hell. If the guy doesn't move at all, march up to him, look him dead in the eyes, and say, "Sir, It's an honor to meet you. Might I shake your hand?" Regardless of their answer, say, "Truly, it is an honor." Promptly walk away. Via CllctCallOfCthulhu.