Two times here. One was where one of my clan-mates on Urban Dead was trying to resolve an inner-conflict by saying that this link would solve all of our problems. Another one was that April Fool’s day on You Tube.
Be honest. There’s no shame in getting rick-rolled. 
I think the worst experience was when a friend of mine disguised the track as a new piece of music I really wanted to hear and put it on my iPod. So I started it up while I was on the train. I say “worst” because I started laughing and the people on the train thought I was nuts.