Hot Tub Time Machine trailer: what Hangover produced this?

You can just imagine how this unmissable cinematic gem came about. You're the head of a major studio and you're at a party. You're in Hollywood, so it's probably a pool party. A drunk friend leans over and says: "Hey! What if this hot tub was a time machine? That would be awesome!" To which you reply: "Yeah, baby! Let's make that a movie!" Hence, some months later, this. At which point you realise the only sensible way to market it is to repeat the title as often as possible. Hear it once and you, the audience member, might feel derisive, possibly dismissive. But the more times you hear it, shouted loud and proud, the more you warm to it. Especially when the director has the wisdom to include shots of Craig Robinson, having just spoken the deathless phrase, "It must be some kind of hot tub time machine!" , then turning to the camera and staring straight down it. As if to say "That's right - I just said that. What of it?" Fantastic. Which is why it's a tad disappointing the rest of Hot Tub Time Machine appears to be a four-way-collision of Back to the Future, Bill & Ted's Excellent Adventure, Ski School (seen it? Don't) and The Hangover. Definitely The Hangover. For, while the family-friendly version of the trailer makes it feel like a buddy movie with a wacky premise… … the red-band trailers add enough narcotics, swearing and bonking to make The Hangover feel like a mild headache. In fact, there appear to be a wide selection of Hot Tub Time Machine trailers with different levels of offence-causing potential available online. If you stitched them together you'd probably come up with a half-coherent version of the finished film. Or at least as coherent as the film itself promises to be, what with all the white powder (not the snowboarding kind), ski bunnies and bathing bears. Is there anything else here, in fact, anything other than a Hangover-hangover of crudity, nudity and physical injury? Not a lot, it seems, apart from a lot of jokes about the taste-vacuum and technological primordial swamp that was the mid-80s, written by people who secretly consider it the high point of their lives. Would it matter, one way or another? Not so much. It's called Hot Tub Time Machine. You probably know already whether or not you want to see it.