Hot Tub Time Machine (2010)

Same old storyline. We've all seen it being repeated several times now. Back to the Future did it and that was the best.
Not a waste of time though. It has its moments, it's completely watch-able. Predictable, but watch-able. The nostalgia-factor is there as well, the scenes from the 80s have been done real well. Something like Hangover, set in the 80s. Not bad.