Do all designers do this?
This happens often with me, and people I have asked it seems to happen to them sometimes too.
Like you are drawing something or writing a letter on paper, and you make a mistake and instantly make the "ctrl+z" hand movement. Or look for the eraser tool. It's realy frusterating at times b/c you really wish there was a real life ctrl+z action. like its an instinct or something. You dont actually make the movement but in your head you do. than you laugh out loud.
other ones that dont happen as often but have, are the occasional moving of the mouse to pick something up. that ones embarassing.