Wacky hijinks ensue, some of them very funny, some dipping desperately into bad taste, some just falling flat. (Which, it's worth remembering, was the case with even the best films of this franchise.)

It's hard to imagine even Hangover fans being satisfied by such middling vulgarity.

At its best, the film is very funny. At its worst, it makes you groan in dismay.

Dumb, meandering and in need of a more well realized arc, 'Vacation' is nonetheless quite funny.