Bite the dust.

In my new office we have nice (office standards) abstract paintings on the walls, but I have yet to find one which is hanging straight.

Back in college I had a teacher who would not be able to start the lesson till all picture frames where hanging straight. How to delay a lesson...

But then again, in those days when classrooms still had blackboards and chalk, she would throw the damp blackboard cleaning sponge at you, with chalk dust flying through the air, if she felt you where not paying 110% attention.

She taught Latin, what did she expect?