 Arwin was a professional bowler, as illustrated in "Bowling", but quit when he lost his ball of the backswing and hit his mother in the head, shrinking her by a foot during a championship match.He also is known for being obsessed with his mother; as he lived with her for his whole life until she was married and moved out as shown in, "The Arwin That Came To Dinner".Arwin is considered childlike by many characters in the show; he enjoys picture books, sleeps with a sock monkey, and eats a lunch packed by his mother.