The line comes from Dinosaurs, the early 1990s family sitcom featuring animatronic dinosaurs, in its recurring Ask Mr Lizard segment. The segment parodied children's science shows, with Mr Lizard cheerfully presenting an experiment and his young assistant Timmy suffering the predictable consequences. His repeated call for a replacement became the segment's running catchphrase and its most remembered joke. Clips and quotes later circulated widely online, where the phrase settled into meme use for any mishap treated as disposable and easily replaced.