In the movie Juno -- which I blogged about last month -- the title character says "Thundercats Are Go!" when her water breaks.
This of course is a conflation of two entirely separate geeky catchphrases:
- "Thunderbirds Are Go!" from the '60s Gerry Anderson "Supermarionation" show
- "Thundercats Ho!" from the '80s animated show that has driven many of my generation into the horrifying recesses of furrydom