Thank god for catchphrases. I can't share my funniest one, because it is unequivocally unprintable. It was hilarious though, and it lasted for years. Happily there are a lot of other people out there still thinking them up, with hilarious results. This primarily relates to a sub-genre of the catchphrase, the "mock catchphrase," and it is usually one that you assign to someone else in jest, or you use yourself ironically. And, sometimes, a catchphrase is just a catchphrase, as below.
There is a terrific article on the Onion's AV Club suggesting some catchphrases for the new contestants on Top Chef. It is a truly good read, but the real gold is in the comments. Whenever dozens of funny people randomly start spewing catchphrases, something magical happens.