The ones I know are:

Go to any video and press "1980" on your keyboard.

Go to any video and press "1337" then look at the comments.

Do you guys know any more cool ones?

Wtf is that 1337. I've seen it but I don't know how it works

All I know is the snake game with the buffer symbol

undefined wrote:All I know is the snake game with the buffer symbol

 I like that one.

Moto wrote:Wtf is that 1337. I've seen it but I don't know how it works

It changed everything into l33t writhing for the comments.

What are you guys talking about?

We're talking about shit that the YouTube Staff puts in to show us that the illuminati is real man! Open your fucking eyes America!!

how to play snake admin?

When you see the buffer symbol on the video press any arrow and you're playing snake
I think its only good when you're running Dial Up and shit

Not a easter egg but, if you click on a video that is on the right in the list from the video you are watching, a thin red bar appears an the bottom of the web adress bar. (Assuming you don't have a bookmark bar.)

undefined wrote:Not a easter egg but, if you click on a video that is on the right in the list from the video you are watching, a thin red bar appears an the bottom of the web adress bar. (Assuming you don't have a bookmark bar.)

 Damn I wish I wasn't to lazy to disable my bookmarks bar.

Mex I've seen that red bar, I see it all the time and I have bookmarks

I have never seen it 'till yesterday...

I don't think it's a easter egg, it looks like a loading bar...

So no one can think of any cool ones?

The 1980 one works. I played the game that popped up while listening to inspirational music

Here is a page showing all these neat ones for this Geek Week on Google
http://mashable.com/2013/08/10/geek-week-easter-eggs/