in the GOOD OL' DAYS of computing, a game known as DOOM came out. and in the earliest versions, a screen that says "DOOM Operating
System v1.1", and that's nothing more than a screen. It's initials are the same as it's Operating
System (MS-DOS) witch stands for Disk Operating
System.
Guy 1: Hey, do you remember seeing something that said DOOM Operating
System v1.1?
Guy 2: You
mean, you saw something that said DOS?
Guy 1: No,
boot-up an early version of Doom, and you'll se it.
Guy 2: Oh, alright. Ill do that later.