Alright - the best, true story I have is of a friend (fellow occasional poster here) and my buddy Jesse going up to do Liberty Crack, essentially as their 1st climb together (other than a day at 32). They are a few pitches up, and as Jesse starts to lead out on the free cracks above the roof, my friend looks up and says, "Hey, you ever notice on the big 'biners if you turn this collar, the gate doesn't open?" Took him totally by surprise.