Talk about your visionaries! Scott Adams is using his Dilbert blog as a place to collect prank ideas for April Fool’s Day.

I think this is destined to become an entry at Wikipedia.

An excerpt:

“One of the best practical jokes ever played on me took me years to figure out. I still don’t know who did it, but it was a beauty. It won’t work if your victim has caller ID, unless maybe you block your number.

Call the phone that won’t be answered, then use three-way calling to call the phone that will be answered. When the target answers, say nothing but connect the three-way call. He’ll hear his own answering machine at home telling him to leave a message.

Trust me when I say this will freak a person out. It took me about five years to figure out how my home answering machine called me at the office.”

Which of course could be taken a step further with coaching calls…

Find the dial-in numbers for a conference call being held at the same time as the one you’re leading. Best if the other call is on a topic that contradicts, such as one of Andy’s Secret Skeptic calls patched into a serious ‘Law of Attraction’ call, etc.

Instead of announcing the beginning of the call as you normally would, three-way call in the other call. (Note: If they’re using this prank too, who knows whose material will end up being taught on what calls…)

Back to Scott’s post - from a Microwave Use Tracking Form, text-messaging LOW BATT to pagers - to dozens upon dozens of laughing-so-hard-I’m-crying prank ideas, this post and its attendant comments are the must-read item of April 1, 2007. Or at least 10 minutes of it is.
Yes the links are real. But here are two warnings anyway:

#1: Some of the prank ideas submitted by commenters are pranks in and of themselves, but of course.

#2: Definitely a ginormous time waster. Sorry.

P.S. I wonder what Google.com will look like April 1?

Update 4/2/2007:

Alas, neither the Hollywood sign nor the Google Logo changed, but here is a little something fool-ish from Google on another channel.