Hart, however, took the slime in stride and, in signature style, cracked a joke about being covered in the bright green goo.
“I have waited for my whole life to get slimed,” he said.
Hart wasn’t the only one to get slimed that night. Demi Lovato, who appeared on stage to promote her upcoming movie, Smurfs: The Lost Village, was also surprised with a shower of green slime.
Watch Hart and Lovato get slimed below.