The time-traveling comedy Hot Tub Time Machine doesn’t open until February 2010, but I’m going to go out on a limb and say that this movie will wind up being next year’s funniest studio-made comedy.  Start with the premise: four pals discover that their hot tub is actually a gateway to the past, transporting them from the present day to the 1980s.  Then just take a look at the cast, which includes John Cusack, Rob Corddry and, best of all, Craig Robinson from The Office, finally scoring what will likely be his breakout feature film role.  If the finished film is as funny as the trailer, moviegoers will being taking multiple dips in this particular hot tub.