I was alerted to the fact that at the time of writing, Youtube has ALL of it's featured videos pointing to the ever famous Rickroll.

They look like normal videos, except they all point to the same video: Never Gonna Give You Up by Rick Astley, aka the Rickroll.

Beware: http://www.youtube.com/watch?v=Yu_moia-oVI (the link the videos point to)

rickroll1

is one of them, note that the link is underlined to show its being hovered over (that's how Youtube does it)

and note the url in the next one:

rickroll2