I've only ever made one parachute jump, and that was enough for me.
I stupidly got the idea that since I fly gliders and you have to wear a parachute when you do that, so you fit in the seat properly as it is designed to take one, I'd better learn how to use one in the correct way.
I did it with the Army, and I thought: 'this is going to be great, I'll get to jump out of the back of a C-130', which I'd managed to convince myself I could just about bring myself to do if I closed my eyes.
But what did they make me jump out of? Yup, a tethered balloon at 800 feet, off a static line. Scared the living crap out of me.
And what is all that crap about 'oh it's just like jumping off a wall when you land' Actually it's more like 'jumping off a wall that's going sideways at 20 mph when you land'.
I'm glad I know how to use a parachute, but I certainly hope that it remains a rather expensive cushion, as I never want to do that again.

Chock