See Simon Pegg as Drunk Ron Weasley Wish Happy Birthday to Harry Potter By Jon Lyus - Jul 31, 2015 0 FacebookTwitterWhatsAppLinkedinReddItEmail On the promo tour for Mission Impossible: Rogue Nation Simon Pegg landed on Late Night with Jimmy Fallon to wish a happy birthday to another great British export. Clearly too much Butterbeer. Harry Potter Gallery Harry looks in the mirror. Glen Etive.