This is not mine, but a buddy of mine told it to me:
He was working in an internet cafe in Romania. An old lady and her 25 yr. old son enter the place, sit down in fron of a computer. After 10 minutes, my buddy sees this guy teaching his mother how to use the PC:
"Mom, now put the mouse cursor on that icon right there..."
(she lifts the mouse and touches the screen with it)