I’ll have an actual — or at least more current — post later today, but for filler(tm), here is the catchphrase that was my favourite (more so than “Norm!” or anything else) when I was watching NBC Thursday nights back in the day. Though the question I can’t answer is whether this was really a catchphrase or just a joke that the writers repeated way too often.
All these examples are from one season. As with most catchphrases and/or overused jokes, I recall that they flogged it really hard for that one season (the third) and then mostly stopped. It’s like Barney said “suit up!” all the time in the first season but rarely said it afterward, and Happy Days mostly retired “Sit on it” after a couple of years. Most catchphrases don’t have a long shelf life.