Episode 39 of "Grounded for Life"
s03e02 Mustang Lily

Since the bar renovations have left the Finnertys strapped for cash, Claudia convinces Sean to appeal to her father Tony for a loan. When he does, Tony tells Sean he has to think about it, and to further torture him, gives Lily his coveted Mustang. Fed up with the grief Tony has been giving him about money and his parenting skills, Sean takes the Mustang out for a joyride, but loses it in a street race to a young punk. Meanwhile, Jimmy reveals the truth about the tooth fairy to Henry, who decides to milk Tony for cash by pretending to lose a handful of "teeth."