WWF Wrestler Rowdy Roddy Piper and Keith David (the pre Sam Jackson badass). Sci Fi political satire from John Carpenter. You'll be quoting this one for years. Plus it has the longest fist fight in cinematic history!
This is a classic alien flick. Who would have thought that the WWF's Roddy Piper was actually a decent actor. Gotta love the alley fight scene - the longest in cinematic history. It goes on forever.