OK, I'm gonna fess up about the time I was the nut behind the keyboard. I was at an offsite meeting with my boss and and others and had a laptop with me. No mouse, just the touch pad.
Although I am right-handed, I usually mouse with my left hand. Boss sat on my left and placed his cellphone on the conference table beside my laptop. While looking at the computer screen, I kept placing my hand on his cellphone and moving it around trying to get my curser to move.