I'm sure most people have gotten one of those emails in which a scary monster jumps out at you screaming loudly. This video has a father tricking his little kid with one of those, and it totally scares the shit out of the poor kid.
This kid is so traumatized, he's like "Daddy! Why did you do that to me? I thought you loved me!" I'm sure the mother was thrilled when she found out. Best cry ever.