Bobby Corso appeared in "The One With Monica's Boots" as the person who got Joey's sister, Dina, pregnant. When Joey discovers this he finds Bobby and brings him back to his apartment in an attempt to marry him and Dina. Neither of them agree to this and Dina has to calm Joey down.
Bobby isn't a smart guy. Dina told Joey that he was very nice and funny, but Joey said "If he's funny... laugh!" Bobby is in a gangsta rap band called Numbnuts with his friend, Rooster.