Today, I thought it would be funny to hide behind the ice machine at work and jump out randomly and scare people. This resulted in my first victim whacking me in the head with a skateboard. FML
Some people just don’t have a sense of humour. The OP was just having some harmless fun and smashed in the head. My coworker does this a lot and people actually find it fun. Some people try to scare him back.
I hope it gave you a concussion. You're there to work, not to act like a six year old.
Serves you right!