zac efron charlie day are neighbors Meet Zac Efron's real life neighbor: 'It's Always Sunny in Philadelphia's' Charlie Day Zac Efron is currently dominating the box office with Seth Rogen in “Neighbors,” the frat vs. family raunchy comedy that plays to both Efron’s and Rogen’s strengths.

Namely, there’s a bunch of penis jokes, a whole lot of pot and Efron spends most of the movie shirtless, with his shirt hanging open or in a tight muscle tee. And hey, it works!

But Efron took the funny to Instagram on Friday (May 16) to show off his real-life neighbor, “It’s Always Sunny in Philadelphia” star Charlie Day, and the antics he deals with on a daily basis.

Check out Efron’s hilarious video below: