Mac and Kelly (Seth Rogen and Rose Byrne), are happily adjusting to their new roles as parents to a baby daughter in a quiet suburban neighborhood. While in the midst of adjusting to their new sleep and sex schedules, a fraternity moves in next door. They don't panic, figuring they are still cool enough to get along with college kids. An initial meeting with frat president Teddy (Zac Efron) goes well, and they even wind up joining the fray, baby monitor in hand, for a drugged-out, booze-drenched party, further establishing themselves as those possibly cool neighbors who just might be able to handle a party house next door. Mac and Teddy even develop a brotherly camaraderie, suggesting that if Mac were just a few years younger, he might've been a worthy frat brother. They even talk about getting walkie-talkies to communicate between their houses. They bond. The honeymoon doesn't last for long. When a weeknight party keeps the baby up, Mac and Kelly transform from party happy neighbors into sleep-deprived malcontents, and they call the cops. Teddy takes this as a stab in the back from his new friends, and all out war is waged. There will be no walkie-talkies for Mac and Teddy. Rogen, Efron and Byrne are hilarious here, in a movie that has some great new jokes, along with making some old jokes funny again. Dave Franco and Lisa Kudrow get good laughs in supporting roles.