One thing I tend to think about is when an elevator door opens. No matter where I should be either on land or sea. I always make sure the lift is there before I step in. Weird huh? Anyone with similar I guess peeves is the correct answer. I have read where elevator mishaps do happen on cruise ships. For instance when the electrician on Carnival Ecstasy was crushed to death underway on a cruise doing maintenance. You can google that to verify.