On the topic of joke holidays: At my school on Wednesday we celebrated National Finger Bang Day. I had ever heard of it before then. Apparently during that day you are allowed to make a gun with your fingers, point them at somebody, and then say "BANG!" to shoot them. They then have to keel over and die.
It was the most fun I have ever had on a joke holiday. However, most are not this awesome and they really need to stop.
Edit: Goddamn I have posted a ridiculous amount over the past two days.