Why? Could be the lack of sun light. You might have gotten your W-2's and found out just how little you made last year. You went skiing and broke your leg on the first run, and your SO kept skiing, and then left you for the hottie they met on the ski lift. Lot's of possible reasons.
Anyway, I am deputizing all of you into my posse of mirth. You are now empowered to go be the class clown, the jokester, the merry maker who bring smiles to other peoples faces.
Laugh long and prosper. May the whoopie cushion be with you.
P.s., Remember funny people are attractive!!!