Emmett is a crazy homeless person, who lives under a highway overpass. He appeared in "Makeover Makeover Makeover: the Makeover Episode".
In "Makeover Makeover Makeover: the Makeover Episode", Abe thought he found the perfect date for Joan of Arc to take to the prom, when he heard that Emmett from under the overpass was single and had no plans for the night. He brought him into the house and asked Joan if she wanted to go with him. Emmett exclaimed that the government was putting fluoride in people's tap water and Joan unsurprisingly rejected him.