Will Ferrell [1] was scheduled to stop by The Tonight Show Starring Jimmy Fallon on Wednesday night to promote his new movie Get Hard, but instead, the actor and comedian came out dressed as snack icon Little Debbie, sporting her signature blue plaid dress and apron, black Mary Janes, and curly red wig under a straw hat. Debbie sat down for an interview with Jimmy (who was repeatedly referred to as "Jim"), did a taste test of her own snack cakes, and made the host do a disturbing Little Debbie promo. He also sang the Little Debbie jingle before passing out sweet treats to the audience. Watch the hilarious video above now, and check out the actual Will Ferrell as he does an impression of one of his famous Saturday Night Live characters, Harry Caray [2].