I'm thirding this recommendation - there would be so much to talk about:
.Henstridge, Statham, Grier, and Cube
.Obvious last-minute script rewrites
.Nonsensical "instant flashback" storytelling
.Ice Cube wears huge Mars camo pants
.The super-90s music
.The insufferable mock-Jane-Lynch scientist
.The leader of the Martians is called "Big Daddy Mars" in the credits!!
...plus you could talk about John Carpenter's good movies too!
Also, it's on Netflix Instant. You guys should do it!