Quote from Kripke in the episode Spoiler: We Couldn't Get Green Lantern
Stuart: Wait a second. Wait a second. Cosmic Treadmill. Kripke: Cosmic-what now? Denise: Brilliant. The Flash. He has the Cosmic Treadmill. Kripke: At the wisk of sounding wedundant, cosmic-what now? Denise: Cosmic Treadmill. It allows the Flash to move between universes. Kripke: Tweadmill? Like at 24 Hour Fitness? Stuart: No, but yeah. Kripke: That's the stupidest thing I've ever heard.