The Christmas raunchfest The Night Before is both ridiculously hilarious in parts and excruciatingly boring in others. Review by Matt Cummings The holiday movie season is like having your parents over: they're fun until they're not, with interest quickly dwindling with every breath drawn. It's hard to understand why the formula is so misused: take the best elements of The Hangover , mix it with the zaniness of Christmas Vacation , with a little buddy/broad raunch from Neighbors , and you should get something really magical. The Night Before is not quite that movie: a stoner flick with lots of premise, some genuinely wild hilarity, but painfully absent for large sections. Every Christmas Eve since 2001, best friends Chris (Anthony Mackie) and Isaac (Seth Rogan) venture out into NYC to honor a long-standing agreement with their friend Ethan (Joseph Gordon-Levitt) whose parents tragically died during the holidays. But Chris and Isaac are ready to move on, wit