Any film that makes us profoundly nostalgic for the heady days of 1983’s National Lampoon’s Vacation deserves an award for services to the rose-tinting industry. So, it’s off to Walley World we go again, embarking on a grisly roadtrip with the Griswolds: Next Generation. The presence of Ed Helms (stepping into Chevy Chase’s shoes) presumably explains the preponderance of knob/ass/rim-job jokes, but it’s hard to imagine even Hangover fans being satisfied by such middling vulgarity. What scant laughs are on offer are all spoiled in the trailer; a sequence that finds the Griswolds swimming in shit lasts less than 20 seconds (set-up and pay-off) in the promo but a languorous 10 minutes on screen, and as always the shorter version is funnier. Original stars Chase and Beverly D’Angelo make wearisome cameos, as does Chris Hemsworth’s prosthetic cock.