It’s Always Sunny in Philadelphia Season 5 Episode 9: Mac and Dennis Break Up

After dropping by to torment Dee and borrow some popcorn for their umpteenth viewing of Predator, Mac and Dennis find themselves the brunt of accusatory comments.  Dennis refers to his sister as a “cat lady spinster with no friends.” Dee fires back, hitting a little too close to home by insisting that Dennis and Mac are worse than an old married couple, spending every waking moment together and checking in with each other all the time.

With the seeds of destruction planted, Dennis and Mac protest their union too much, finding ways to argue to ensure that they’re not really “an old married couple.”  After an argument over possibly watching The Transporter instead of Predator during movie night, Dennis and Mac decide to “break up.”  Dennis goes off to spend some quality time with his sister, Dee.  As Dee’s cat goes missing, hiding in a hole in the wall, Dennis suggests she should just let the cat die in the wall and demands Dee do all the things Mac used to for him: peel his apples, light his cigarettes, etc.