The fake HP guy said "they" are making pony-themed laptops and it tricked the moderator into posting that onto EqD, spreading the lie to every single brony on the internet. That wasn't the impressive part. (If it was, I wouldn't be redundantly posting a topic already covered on EqD.)
No, this was.
And the comments.
Epic.
Edit: And it was at the last minute I find out Tek posted a bit more than just that.
January 19, 2012: "Neodymium" (I'm kinda curious how much this is truth or lie.)
The "congratulations"from "HP" happened on January 24th, and the post on EqD was on the noon of January 28th. The apology was posted on the same day, 3:37 PM.
It makes some more sense, he knew this guy a week before so "HP" played around long enough to gain some trust.
And in the comments, Sibsy also got tricked. XD