Even though London's Star Wars Celebration left the Internet bustling with news, perhaps nobody at the star-studded event was busier than Mark Hamill. Between a litany of panels, signings, and more, Hamill somehow managed to still find time to laugh with fans during the weekend. And, of course, the actor took a moment to relax when a fan gifted Hamill with a custom, Joker-inspired lightsaber which came complete with his iconic character's laugh.