Skydiving Mishap

Have one of the jackass guys think the skit is to go tandem skydiving with a funny costume on but the real prank is right as the jackass guy and the skydiving instructor jump out of the airplane the skydiving instructor says, "oh shit" and pretends their was a malfunction with the parachute that they're not deploying and then when they get close enough that they need to deploy it he deploys it and the jackass guy has been scared shitless