I remember my tech-savvy uncle was used to PCs which could read double-sided floppy disks. His jaw about dropped out of his skull when he saw me do the 0.5 sec

I remember my tech-savvy uncle was used to PCs which could read double-sided floppy disks. His jaw about dropped out of his skull when he saw me do the 0.5 second floppy-disk-flip that Apple IIc gamers got used to doing, because they could only read from a single side of the disk.