That depressing period of time when you're home from college but there's absolutely nothing to do.
"Hey wanna go to a party tonight? Oh wait, we live in the suburbs..."
"It really sucks being home from college where there's nothing to do and nowhere to go/drink. We've got the sophomore blues."
When a man has sex with a girl on her period, he takes his dick out and rubs it on her lips making it look like The Joker from The Dark Knight. When she gets pissed, ask her "why so serious?"
"Joe gave me The Joker last night, it was disgusting."
"Thats not funny!!"
"Why so serious?"