Heh...you know, this one is strangely addicting. I think I've watched it ten times or more since I found out about it a week ago. I'll warn you: It's annoying. VERY annoying. Charlie's unicorn friends would be the cause for that. Also, through the whole thing you just keep waiting for something bizarre and horrible to happen, and sure enough...but it's pretty funny.
I love the exploding letter people.
P.S. In my opinion, the other films (one of which is also animated) on the parent site for this cartoon are not even worth a glance.