OK, so you are depressed about the economy, the UN, the world going to hell in a handbasket, and you need a good laugh. Here you go.
First, here is a great practical joke. I'm glad it is not me, but it is amusing. Funny Protest Prank.
Next, I have never seen a cat do this. It is courtesy of the lovely Fr. Z, One Goofy Cat.
Finally, It is not a video but a hilarious piece from Conversion Diary. Warning...it is naughty, which is why it is funny. The comments are enough to send you over the edge.