When I was little I once read about "gas carriers" - on a pic there the ship looked like normal 70s tanker to me but had several these big half-spheres on deck, filled up with gas. My first impression was that it's scary because of a thought that those big spheres can explode at any second, sorta like a balloon with a needle at it.

At least we can laugh !!!!

Lol @Denis...had to Google it