I love this film.
I actually saw it by accident because the video carried on recording all night after I recorded something else and I thought I might as well watch it, after all, the title was pretty amusing. It turns out that so is the rest of the film.
I can't remember a single minute where I was bored, it had me laughing all the way through, especially the moron's reactions when the door falls off their spaceship. Desmond's line then had me giggling all night. It's hilarious when they 'play' chess too.
It's probably not the sort of thing that appeals to everyone, but if you like crazy comedies about beer guzzling morons from another planet then this is the film for you. It's definitely British comedy though, which is different to American comedy and I think funnier, but in a different way.
I'd recommend this to anyone who's looking for a good night in with a few mates and a lot of laughs, but it you're after something in any way serious and thought provoking, look somewhere else. On course if that's what your looking for you wouldn't even be reading up op a film with that title, I hope.