While jumping this weekend off a helicopter, my dad had a pretty scary experience. He climbed out on the skid and did a gainer off of it, and while mid flip he noticed his lines around his head. His main had deployed without him actually pulling it AND while in a very unstable position. He recovered somehow and didn't have to cut and pull silver. How the hell could this have happened? He buckled the seatbelt behind him and didn't make contact with the skid. It definitely taught a lot of people at the DZ a lesson on jumping from the chopper though.