Yesterday afternoon we were at a birthday party at the neighbors house. The kids were all downstairs playing. I was loosely supervising about 5 kids when I look up and see Arthur sauntering down the hall away from the playroom dragging a green colored pencil down the white wall. 

To make matters worse, the birthday girls dad was standing right at the end of the hall watching Arthur disrespect his formerly clean white walls. 

I owe them a magic eraser.