A spokesman for the Sears (still can't call it Willis) Tower claims there is no danger to tourists when they step out on a cracked pane of glass however many people don't want to take the chance.

Put me in the category of not wanting to take the chance!

How scared were the people who were standing on it when it cracked?

http://news.yahoo.com/cracks-appear-in-willis-tower-s-skydeck-145710739.html