Ah, April Fool's

Honestly, I'm not a huge fan of April Fool's Day. All the really good jokes will most likely get you fired and arrested nowadays, so it's mostly just morning DJs on the radio making some poor woman at a Chinese place sound like an idiot, which isn't really my idea of a good time, but Google had a pretty good one for GMail today. They introduced a new fake feature called Custom Time where you could essentially forge the sent timestamp. That in itself is a clever joke, mostly because it's so easy that for a second it's like, "Yea, that could work," even though it would be a horrible horrible thing. But the FAQ is priceless. The help page is here, not sure if it will stay around so I'll quote a few choice sections.

Is there a limit to how far back I can send email?

Yes. You'll only be able to send email back until April 1, 2004, the day we launched Gmail. If we were to let you send an email from Gmail before Gmail existed, well, that would be like hanging out with your parents before you were born -- crazy talk.

And one of the beta user testimonials.

"I used to be an honest person; but now I don't have to be. It's just so much easier this way. I've gained a lot of productivity by not having to think about doing the 'right' thing."

I also like that they went overboard enough for it to obviously be a joke by the time you've read the whole page, even if it seems plausible at first. This way everyone gets a laugh and you don't have people feeling like total idiots. A perfect little joke.