Watched this with my sister and her husband last Friday. It's very much a "turn your brain off and just enjoy" kind of film.
Basically, in a nutshell, it's the story of a comedian's drunken fratboy exploits on a trip to Moscow in the 90s coming back to haunt him years later, when vengeful mobsters (after an heirloom pocket watch stolen during said exploits) abduct said comedian and his father to Russia to either find what was stolen, or exact retribution.