I was there when Rick Rolling started on 4chan in spring of 2007, I think it was April to be exact.
For those that don't know, the "rolling" term came from a practice of linking to a different thread on 4chan from the one you were posting in that would have have a photo of a rubber duck with wheels on it, hence "duck rolling" and the idea was to trick you in making you think you were being linked to something else when you were in fact being "duck rolled"
Rick Rolling was like that but linking you to the music video of Never Gonna Give You Up.
The first time I got Rick Rolled was when someone claimed the GTAIV trailer got leaked, I clicked the Youtube link and sure enough there was Rick Astley singing his heart out.
2000s era 4chan was a fucking blast, I miss it, it's a shame how shitty it became.