I think I've watched this 4 or 5 times in the last year. I just can't stop laughing.
Sightseers is totally unconventional and off the rails and also bloody brilliant. The director, Ben Wheatley (this is the first film I've seen of his), has balls that are rarely seen in Hollywood. Oh yeah, this film is extremely un-Hollywood; it's very, very BRITISH and I'm such an American ('the FUCK is a caravan holiday? a glorified road trip?) that a few of the cultural references probably went over my head, but that didn't bother me in the least.