I had a ride on Georgia Cyclone that was pretty terrible. It was the end of the day and there was no line, so I decided to give it one more shot (having a rough time earlier that day), and, well, I'm glad it was the last ride of the day. The ride has seat belts and single lap bars, and my lap bar only ratched down a couple clicks! I yelled at the ride op to either fix it or let me switch seats, and she basically shrugged and said "yeah, you're fine." I took her word for it.
Now, I'm kind of a skinny twig, so... it was an interesting ride, to say the least.
Thankfully, the years have not been kind to GC, and the ride doesn't have much airtime anymore. However, it was by far the roughest ride I've ever had on a coaster (excepting possibly Ninja). You are not meant to move around that much on any ride, ever.
And when there was airtime... my poor crotch.
Anyways, I left that park wishing I'd had the balls to ask for a free pass or something from that op. Seriously, that was rough, and I deserved compensation!