They aren't so catchy anymore:
The only genres where catchphrases legitimately flourish are sports and reality competitions, where each show has its own. "The tribe has spoken. It’s time for you to go." Top Chef has "Pack your knives and go," Top Design had "See you later, decorator," and The Apprentice, of course, has "You’re fired." Generally, there’s a limit of one slogan per show; in recent cycles of Project Runway, Tim Gunn has eased up on his use of "Make it work," giving Heidi Klum’s "Auf Wiedersehen" more room to shine.
On the science of catchphrases here.