Johnny Galecki acted in an HBO sitcom for ten years.
 In July 2011, he played a parody version of himself in three episodes of Entourage
 Galecki also appeared in the films National Lampoon's Christmas Vacation (1989), Prancer (1989), Suicide Kings (1997), I Know What You Did Last Summer (1997), Bookies (2003), In Time (2011), and Rings (2017)

