Seatbelts are a great idea when you're taking off in a plane. Not so much when you're exiting a plane. This skydive instructor forgets to unbuckle his seatbelt before exit, and ends up hanging from the plane as his student exits alone on his first (unplanned) solo jump. We all make mistakes, and the key is to learn from them. I'm sure he'll be dreaming about seatbelts for weeks to come and won't forget to unbuckle anymore.