It's unfortunate that April Fool's Day falls on a Sunday this year. Perhaps save this idea for next year!
I went to Krispy Kreme doughnuts and bought 2 dozen original glazed doughnuts and asked for an extra empty box. Inside the empty box, I placed 2 medium veggie trays that I had picked up a local grocery store the night before. To my surprise, it was a perfect fit for an awesome prank. The box with the veggies was left in the Office Kitchen to victimize the many doughnut seekers. A note was placed under the lid asking the victims to remain quiet, close the lid, and that actual doughnut were stored at my desk and they are welcome to swing by and grab one.
It was to my surprise at exactly how many people ended up taking some veggies and closed the lid as asked. Seems like many of them wanted others to fall for the joke as well.
The veggies were gone before the doughnuts, but, in the end, all were consumed. Many got a good laugh and were actually quite thankful that them giving into a sugary breakfast ended up yielding a healthy snack.