Red Forman's catchphrase "dumbass" in That '70s Show was actually first said by his son Eric in season 1, episode 5. Despite Red's frequent use of the insult towards Eric and his friends, Eric was the first to utter it. This parallel between father and son continues in the spinoff series That '90s Show, where Eric also adopts Red's catchphrase. Eric's role as the first to say "dumbass" highlights the similarities between the two characters.