I fly gliders, where it's fairly common to wear parachutes in flight to guard against structural failure or mid-air collision.
We're told that when we're done flying, we should always exit the glider first, then remove the parachute. Some people will unbuckle the parachute first, then step out. Some of these people have gone on to bail out in flight, and they undo their seat belts, unbuckle their parachute, and then bail out of the plane without it.
In indoor climbing arenas, people operating the safety line may unbuckle it seeing their regular partner land safely on the floor, even if they aren't securing their regular partner at that particular moment. Here, the recommended procedure is to always have the one who was climbing release the security line.
I fly gliders, where it's fairly common to wear parachutes in flight to guard against structural failure or mid-air collision.
We're told that when we're done flying, we should always exit the glider first, then remove the parachute. Some people will unbuckle the parachute first, then step out. Some of these people have gone on to bail out in flight, and they undo their seat belts, unbuckle their parachute, and then bail out of the plane without it.