Rick Roll, I called it as soon as I saw the youtube link.
But yes I agree with Cass had just said, while I enjoy a good joke as much as the next guy, some people out there may not be so understanding, and I am sure the rest of the staff do not want to deal with some people throwing a hissy fit.
So remember it's all fun and games until someone types in all caps and uses a lot of exclamation points.