A Guy Thing (2003)

It's his bachelor bash, his one final night to be a wild single guy, but Paul isn't exactly the life of the party. Instead he's determined not to do anything he can't live with later--or tell his fiancee, Karen. That's why it comes as such a shock when the phone rings the next morning and he wakes up to discover a lovely stranger named Becky in bed next to him with no clothes on. Worse yet, his mother-in-law-to-be is the one who is calling. Even worse, she tells him Karen is on her way over. Paul zooms into frantic action, shooing Becky out and desperately trying to rid the apartment of any evidence of wrongdoing--even though he can't remember doing anything wrong. When Karen does arrive and asks him how his bachelor party went, Paul tells a teensy lie to cover up what may or may not be the truth. The teensy lie turns into a bigger one and Paul soon finds himself in an ever-escalating comedy of errors with no apparent way out--except up the aisle.