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.