Yay! I found an easter-egg! I didn't read about it. I wasn't told about it. I actually found it! By myself! I feel accomplished!

I was derping around with devtools here on Derpibooru; I was going to declare a function, and as I was typing "fun…", devtools suggested me "funFunFun"… It peculiarly makes a bunch of pink boxes with the word "Random" stamped into them appear randomly around the screen…

To try it out, simply type "javascript:window.funFunFun();" on you address bar. You have to actually type it, copying and pasting will not work.