I remember back in the early 90's installing an extension on every Mac in the school computer lab that made typewriter sounds on every keypress, including that

I remember back in the early 90's installing an extension on every Mac in the school computer lab that made typewriter sounds on every keypress, including that "zzzzzzipDING!" sound when hitting return (or was it "DINGzzzzip"?) It was hilarious for a few minutes, then got old really quick, so it didn't last the day. The Oscar extension stuck around for months though ("I love it because it's trash!"). Computers were just so much fun back then...