...osa N

Rickrolling is a prank and Internet meme involving the music video for the 1987 Rick Astley song "Never Gonna Give You Up". In a Rick Roll, a person provides a link they claim is relevant to the topic at hand which actually takes the user to the Astley video. The URL can be masked or obfuscated in some manner so that the user cannot determine the true source of the link without clicking (and thus satisfying their curiosity).

(Wikipedia)