True story: while delivering some computers to the Pittsburgh Paint & Glass refinery near Lake Charles, the guard gave me a colored hard hat and a filter. When I asked what it was for he said it was in case of an ammonia leak. He said put the filter in your mouth, use the clip to close your nose and follow anyone wearing a given hardhat color out of the plant

When I asked him some question about this potential disaster, he said "Ah don't worry about it, you'll be blind from the ammonia anyway." Yeesh.