Post Christmas Depression

It's when you're sad because Christmas has passed, and you know that you're going to have to wait almost a year before the next time you get free stuff other than your birthday.

Bro 1: "You don't look so hot, are you okay?"
Bro 2: "Yeah, just post Christmas depression is all."
Bro 1: "Oh yeah, now that you've reminded me, I'm also suffering from PCD..."