Funilly enough I could have pulled this off, but didnt...

Although my fav Exchange story was at Lockheed:

We sent an email 'on behalf of' the Head of Council (the top corp Lawyer) for our division, to our entire group.

"Come by my office for Coffee and Doughnuts!"

Droves showed up to his office asking for coffee and doughnuts.

On April Fools Day.