I used to erase blackboards, but haven't seen an eraser for a long time. It used to be fun to let my fingernails overlap the felt just enough so that they made a real screech. The teacher was as deaf as I am now, and kept wondering why the girls were jumping so, until one of them squealed on me. I got excused from further blackboard duty.
How do I clean my slate now? The moving finger keeps writing.......