I know everyone on here is gonna say get their little willy out and waggle it at him, but I would genuinely just give him a steely glare and a slight nod.
I met him at Liepzig's Gamescon in 2007 I lit him a cigarette, had a small chat with me before attending MGS4 showcase. He left when Yumi Kikuchi (Raging Raven) came and told him they were about to begin the show. Very kind guy