Explain this to me
I do not understand how Rickrolling qualifies as a joke. Or why a bait switch link is funny. If Rickrolling makes you laugh, please explain why. I'll accept brain-damaged as an answer. Here's how the thing appears to me:
Person who doesn't understand humor: Hey, Bill! There's this great youtube video of something amazing!!!!! Here's the link !!!!!!!!!!!:)
Me: [click -- Rick Astley video plays] Um, that's "Never Gonna Give You Up." Did you copy the wrong URL?
Person who doesn't understand humor: PSYCH!!!!! You've been rickrolled!!!!!!
Me: Oh, you meant to send me there. I didn't know you were such an Astley fan.
Person who doesn't understand humor: I'm not, I totally burned you!!!!!
Me: Huh?
Person who doesn't understand humor: I tricked you !!!!! You thought you were going one place and I sent you to another!!!! HAHAHAHAHAHAHAHAHAHA!!!!
Me: ..................
Person who doesn't understand humor: I think I crapped my pants.