Protect your cat videos for great justice. A new YouTube easter egg lets you play Missile Command — that artifact of early ’80s Cold War consciousness and Golden Age game mechanics — above whatever video you’re watching. Just load up the Flash player and type “1980” anywhere outside a text field to start shooting down a never-ending barrage of incoming ICBMs.
The easter egg is part of YouTube’s “Geek Week” celebration alongside other secrets like a “leetspeak” comments mode and an homage to the Fibonacci number sequence, among others. Check out the list below for all of the tricks that have been uncovered so far, via Google Operating System: