When I used to hang out at Radio Shack in the mall to play on a TRS-80's after school, they would draw a pair of asterisks in the corner of the screen and occasionally flash one of them on and off, as they loaded from cassette tape.
One of the older kids who hung out there would tell us newer kids that we could speed up loading by repeatedly pressing the up arrow key on the keyboard.
Of course us new kids didn't realize that the loading speed was completely determined by the cassette tape speed, which the keyboard couldn't possibly affect.
But at least it gave us something to do while waiting, and the older kids something to laugh at.