I like things to be straight, too. Picture frames get straightened out. Then I put small piece of command strip on the back of the frame, attached the other piece of it, took the paper off and pressed the frame against the wall in the correct place. That picture will never move.
Our new library is right next to the train tracks (It looks like a depot). When trains go through the pictures of trains on the walls are vibrated out of place. They need the command strips there, too.