Best April Fools Office Pranks Ideas for Coworkers & Boss?

So today is April Fools day and I'm at the office right now.
Everyone has been acting very strange towards me and I know my coworkers and my boss are onto something.
My guess is they have prepared a prank for April Fools day and I'm the victim, my coworkers and my boss always play jokes on me.
What are the best April Fools office pranks? I want to try one, please suggest your best ideas.

I was also looking for office pranks ideas for April Fools and this is what I found so far:
Stick a post-it note under your coworker's mouse so that the paper leaf covers the mouse laser. It won't work anymore.

Hang signs around the office that say, in big bold letters, "Now Under 24-Hour Surveillance."

Text your coworkers pretending to be their boss and tell them to be at work 30 minutes early today for an urgent meeting.

Tape this sign over the printer, and make the IT department say the printer is now voice activated. Watch people scream at it, when it doesn't do a thing.