First, Hamm surprised festival attendees when he and actor Zach Galifianakis performed a duet of "We Are the World" at the festival's SuperJam, where artists come together to cover classic songs.

Apparently, during the duo's sing along of the 1985 charity single, Hamm also tossed Galifianakis a few gummy bears, which sparked some jealousy in Belle & Sebastian's Stuart Murdoch. In fact, Murdoch got so worked up that he couldn't help but share his feelings with the crowd who came out to see his band's set later in the weekend.

"I haven't seen any other bands yet but I wandered into the comedy tent," he told the audience. "That's where I found Zach [Galifianakis] and he was being fed gummy bears by a certain friend of his and I thought, 'Why doesn't that ever happen to me? Why can't I be fed gummy bears onstage by a famous person?' I wonder, could you come and feed me gummy bears? I've got them here. You can throw them from there."

Murdoch then runs to the back of the stage and places a bottle of gummy bears down. Hamm walks over, takes off his hat and is quickly recognized by the audience.