Snakes on a plane is a great, great film. Actually, let me qualify that. It's an awful, awful film, but is one of the very few that successfully walks the line between stupidity and silliness. It's fantastic fun to watch especially with the audience wincing and clapping at appropriate points. There was an especially loud cheer at one particular point, near the end of the film. Watch it and you'll know exactly which one I mean. And how can you not love a film where a snake bites someone's genitals off?
Caveat: I strongly recommend that Little Miss Show Off and anybody else with a fear of snakes not see this film. I don't have such a fear and I was a bit queasy in places.