One of the most memorable pranks that I have played on my office was the "cleaning of the phone lines"
I had our office manage purchase clear plastic garbage bags for the "blowing out of the lines". Each agent was given one with a memo of the date and time that they were to have their phone in a bag in their wastebasket on top of their desk so that the phone company could "blow out the lines"
Believe me to keep this going with out laughing or breaking it was the trick. Agents grumbled. The cussed and discussed whether this was real or not. Only give yourself about a week to get this done cuz you can't keep a straight face any longer.
We had one little set back through the process. Our phone specialist happened to stop in the office and when the office manager asked him about it, he actually played along. That was the best part for me. To this day I take a ribbing from him about this prank.
Well the night of the blowing out was fun. Some had their phones in bags some not. I then sprinkled pixie dust on their phones and left them a happy note.
Enjoy this prank if you choose to do it, it is good clean fun.
Happy April Fools