YouTube has a cool feature that generates a playlist of 10 recommended videos. Make sure you are logged in and visit this page.
There's an experiment that places a "play" button next to the YouTube logo, by which you can generate the "I'm Feeling Lucky" playlist.
If you don't like the playlist, click the button again.
If you want to enable the "play experimental" button and you use Chrome, Firefox, Opera, Safari or Internet Explorer 8+, follow these 4 steps:
1. open youtube.com in a new tab and log in
2. load your browser's developer console:
* Chrome - press Ctrl+Shift+J for Windows/Linux/ChromeOS or Command-Option-J for Mac
* Firefox - press Ctrl+Shift+K for Windows/Linux or Command-Option-K for Mac
* Opera - press Ctrl+Shift+I for Windows/Linux or Command-Option-I for Mac, then click "Console"
* Safari - check this article
* Internet Explorer - press F12 and select the "Console" tab.
3. paste the following code which changes a YouTube cookie:
document.cookie="VISITOR_INFO1_LIVE=LVXsOMb_c_g; path=/; domain=.youtube.com";window.location.reload();
4. press Enter and close the console.
To go back to the standard UI, follow the same steps, but use the following code:
document.cookie="VISITOR_INFO1_LIVE=; path=/; domain=.youtube.com";window.location.reload();
That's all!