Collapsing Catwalk
The Collapsing Catwalk was an obstacle featured in the third season, the episode being Ladies Night, an all female episode.
The Collapsing Catwalk had hinges that would tip the whole thing if the person didn't jump far enough, as shown at the right. The person would fall off. This obstacle is similar to a Season 2 obstacle, Plank in the Face, but the planks had less room to stand on, and the catwalk has more room for the contestants to stand on.