As the film's juvenile leading men realise a night of wet hot-tub partying in the present day has taken them back to the 80s, one of them looks at the titular jacuzzi, snapping and crackling with unseemly energy, and deadpans that it must be 'some kind of hot tub time machine.'
For in the world of this immature, bawdy, surprisingly affectionate yet sickeningly inappropriate film, that's the only thing it could be. This is a paean to cinema of the 80s, a buddy movie, and a time travel comedy, all rolled into one mad package. It doesn't succeed in either genre, and overstays its welcome thanks to its pottymouth, but it does have its moments. It would, however, be best watched while drinking copiously with a group of friends who aren't averse to high-fives.
The scenestealing Rob Corddry plays Lou, a drunken moron gunning his car engine so passionately to Motley Crue that it looks like a suicide attempt. Old buddies Adam (John Cusack) and Nick (Craig Robinson) step in, and decide to cheer him up -- and themselves, for their lives are not worth recounting -- by revisiting a site from their glory days, a ski lodge that once gave them the weekend of their lives.
They drag along Adam's nephew Jacob (Clark Duke) and discover that their revered Kodiak Valley is now a dump. No matter. As the film's title has promised, they drink themselves silly, get wet, and travel back to that very weekend in 1986. On seeing Where's The Beef t-shirts, jhericurls and Walkmans, they justifiably panic, realise they mustn't upset a thing because any small change in the past could impact the future massively, and then proceed to predictably make a spectacular, catastrophic mess.
There is much 80s love with legwarmers, Poison concerts, and references to films like Red Dawn, The Karate Kid and Back To The Future -- from which this film not just borrows scenes, but even actor Crispin Glover, here playing a bellhop with a predilection for arm-endangerment.
Having the fantastically flabbergasted John Cusack in the lead just helps, and the best part about this film is all the 80s-ing.