What happens when two massive sci-fi geeks write a film about two massive sci-fi geeks that's aimed squarely at massive sci-fi geeks and is packed to the sprockets with massive sci-fi geekery? In the case of Paul, the answer is a big bag of nerdy funballs which scores higher on the ROFLometer than any other comedy from the last few years. Especially if you're a massive sci-fi geek.
Unavoidably a few jokes fall flat - why obscure 1992 melodrama Lorenzo's Oil is targeted for a major pun rather than another geek touchstone is a mystery - and Greg Mottola's direction fails him in a couple of crucial but annoyingly bodged scenes towards the end, but these are easy to forgive when the rest of the film is more fun than an unsolicited anal probing.
Obligatory gush over David Arnold score: It's fantastic.