Phil Plait is an astronomer and major sci-fi geek. He writes the Bad Astronomy Blog for Discover Magazine and is also the host of the Discovery Channel's science show "Phil Plait's Bad Universe." You can follow him on Twitter at @BadAstronomer.
When I watch a sci-fi movie, it's no picnic inside my head. I'm simultaneously a scientist and a geek, and the two maintain an uneasy truce—and you never know what scene in a movie with start up hostilities.