I think what amazed me the most is that they came up with the trick in the first place. I've seen other contortionists bend themselves into small spaces, but with these gals, somewhere along the line, after one of them got in the box, the other one said "Let me see if I can fit in there, too."
Really what would posses you to even consider doing something like that in the first place? Nothing better to do on a saturday night or just got tired of being stuffed in a locker when he was a kid in school?