Comment by ot1138

I intentionally caused a problem like this for a co-worker in 1996.

He was a flamboyant character and had a habit of talking loudly on the phone for an hour or so a day. I modified his mouse driver to give me remote control on demand and installed it when he was away from his computer.

For the next few weeks, I would wait for his daily call and gradually move his mouse as he was trying to use his computer. He was visibly frustrated and eventually caught me when he went on a rampage during his conversation and he caught me laughing.