From Tom Cruise to Heidi Klum, see which celebrities have been covered in green goo at the annual Nickelodeon awards show
Joking that he was born a "birthday-less freak," co-presenter Jonah Hill (not pictured) suggested Perry should be the one to open the box that would reveal the winner's name at the Pauley Pavilion on March 27, 2010. Before Perry could announce the Favorite Movie Actress, a burst of slime squirted her in the face and she fell to the floor. "Why does it taste like boogers?" the singer asked.