A man is dead after getting knocked off the top of a semi truck in Texas. Houston police say the unidentified man either jumped or climbed onto the tractor-trailer as it was driving down the freeway. He began dancing on top of the truck before being knocked off as the vehicle went under a bridge. He was rushed to an area hospital where he was pronounced dead. The driver of the semi was unaware of the dancing stowaway and was later released from custody when it was determined he wasn't impaired. Police continue to investigate the circumstances of the incident. It's believed the man was possibly recording himself prior to his death.