Galaxy Quest is awesome.
Imagine a show like Star Trek, except cheesier, only aliens pick up the broadcast, think its a documentary, and go "we're a bunch of spineless wimps and we've been enslaved. Lets go hire those guys to overthrow these other aliens." And then built a spaceship based on the complete bullshit and handwavium tech used in the TV show.
As in it works because it worked in the TV show in exactly the same manner.
So they abduct the actors from a sci-fi convention (they literally crash land it in the parking lot because none of them can fly it (the controls were based on the completely arbitrary hand motions one of the actors made up)) and go "here, save the galaxy."
So you get stuff like that sequence for two hours.
It's brilliant. I'm going to watch it tomorrow. Again, that is. I've seen it twice.