First Computer Virus Unleashed! - Playtech
On this day in 1982, a computer virus was unleashed upon the world for the first time!
Before this, computer viruses had never infected an PC's outside of the labs that they'd been developed in - but this one was developed as a prank by a 15 year old student!

The "Elk Cloner" was a boot sector virus that was hidden inside a game, and on the 50th time the game was loaded you'd instead be presented with a poem about the virus - while also infecting every floppy and machine that it came on contact with!

Although the virus itself did no intentional harm - it showed a massive flaw in security and paved the way for many other malicious pieces of codes over the years.