The Reference: Scare Tactics
Andy comes out dressed as a bear in an attempt to scare the assistants. This is a spoof on the show "Scare Tactics", a show in which average people are thrown into a situation and then actors set up the people to believe that something really really scary is happening. At the end of the prank, the actor asks, "Are you scared?" (as Andy was trying to say) and that's when the prank is revealed.