It doesn't hurt anyone... I mean... it might hurt their feelings if they are too hasty and run it without even looking at the code, because it alerts to the fact that you shouldn't run obfuscated code you don't understand, and that would mean you, if you had done so.
I started by loosing XP. You know what? I'm glad I did. It means some people didn't like it, but I still feel like I was doing an important part in the community and, even though many won't admit it, I simply taught them a valuable lesson.
If anyone was hurt with it, it was only on the inside. I'm sorry, but better be fooled on April Fools than losing the contents of your harddisk on any other day, right?