Found this sign in the Paris Metro. Found it both amusing, and surprising that it was in English, and it didn't have another one in French next to it. Guess the French just know. It's the stupid Americans and English that need a reminding.
It's funny because you're implying that you can't smoke cigarettes within the vicinities of this building, but in the rare event that you spontaneously combust, you have the right to release smoke. This can be used as a signal fire to get help from another.
Cheers