Since the FB was little he's been shouting "Green Man come out the pub" every time we wait at the lights to cross. Since the weekend though, he's taken to cupping his hand to his mouth and shouting that little bit louder. Hasn't made much of a difference. He also shouts "Stop!" at car alarms when out and about, and weirdly, they stop. Doesn't work when indoors though. Useful skill I think.