Cutting a notch in your floppy disk to write protect it....

Same thing for VHS tapes. That had to be something **super **important, like if they showed Raiders on TV

Cut a little square hole in the side of a 5.25" floppy to double its capacity.

Or, as my lazy ass would do sometimes, move the slider and grab a magnet so maybe my "homework" wouldn't load and I'd get another day.