Let me just say this first - I'm a VERY paranoid person and would rather sacrifice airtime for a tight seatbelt than be afraid of falling out of a ride. That said, I have two *minor* little incidents. While going up the lift of SkyRider(PCW-TOGO standup), I was pulling to the sides the two restraints with the handles on them that kind of function like OTS's but you push together instead of down, and they popped open about three notches - needless to say, I shut them as tight as I possibly could (can't....breathe...). Still didn't hold on though :). My other little incident was on The Bat at Canada's Wonderland (Vekoma boomerang) - going backwards up the first lift, the restraint opened a little, but I let it stay that way until the second lift... it was fun!