After successfully skewering Hollywood’s scariest movie (as two of the writers on “Scary Movie”), romantic comedy franchises (“Date Movie”), and Hollywood blockbusters (“Epic Movie”), writers/directors/producers Jason Friedberg and Aaron Seltzer now set their sights on “300″. The heroic Leonidas, armed with nothing by leather underwear and a cape, leads a ragtag group of 13 – count’ em, 13! — Spartans to defend their homeland against the invading Persians (whose ranks include “Ghost Rider”, “Rocky Balboa”, the “Transformers”, and a hunchbacked Paris Hilton).