emergency egress, sans 'chute?

I once visited a flying club where all of the pilots routinely used parachutes for all flights. For instruction, personal flying, all flying. I found this to be a great safety initiative.

However, I was horrified to see some of the experienced instructors get out of the gliders by unbelting the aircraft harnesses, then unfastening the parachute, and getting out, leaving the parachute in the glider. (I won't say the name of the club to protect the guilty). I scolded them, "You shouldn't do that, you'll get in the habit, and someday, when the need arises, you'll have to bail out in an emergency. You'll follow that habit and jump out of the aircraft without the parachute."

But then I thought about it: Surely nobody would ever *actually* do that in an emergency! Right?

Earlier today, while reading this blog at soaring cafe,
http://soaringcafe.com/2012/05/the-b...e-you-ready/4/
and watching the video he
http://www.eaavideo.org/video.aspx?v=1404862537001

....the master parachute rigger in that video claimed that there were documented cases of pilots bailing out without parachutes; after having fallen back to their habitual procedure of unfastening the aircraft harness, then unfastening the parachute harness, then bailing out sans parachute.

Does anybody actually know about this ever happening?

(I've also e-mailed the guy who did that excellent presentation, asking him to back up the claim).