Over the last few weeks, I've seen a few posted videos of a bridge in China that is made of glass, and some people who are attempting to cross it keep panicking because they think they will fall through the glass. That's understandable since the bridge is so many feet up in the air, and they can look through the glass and see what's beneath the bridge and how far they will be crashing down if they fall.
It was stated that the glass that was used to build the bridge is very thick and durable, and is capable of supporting a person's weight adequately, but it's still scary to walk on glass no matter how safe they claim it is--especially when you're several feet up in the air on a bridge.