It was a great nark on disaster movies, and a lot of the rest of it is from Grapes of Wrath. The covered in come scene was hilarious by itself, but I literally cried when Randy screamed "He slimed me," a line for all the Ghostbusters fans out there.
Trey and Matt seem to be taking shit from movies etc. a lot more lately. Or maybe I just haven't been seeing how much they're using until now? I dunno.