Zoolander's Ad-Libbed Comedy

One of the funniest lines in "Zoolander" (2001) was ad-libbed. JP Prewitt (David Duchovny) spends a full minute explaining why male models are being used for evil. Stiller forgot his next line, so he repeated, "But why male models?" Duchovny rolled with it, saying, "Are you serious? I just told you that!"