[wjoe]

It might have been set up as an April Fool's joke, but it is also a real thing that works.

[SilasX]

A lot of viable products came out that way. Gmail, I think.

Edit: Looks like it wasn't intended as a joke, but was initially received that way because of the timing: https://en.wikipedia.org/wiki/History_of_Gmail#Public_releas...