Make a cake. A big one. Write something obscure on the top of it:
“How about 1972?”
“He just wouldn’t SHUT UP”
“Texas, here we come!”
“Tuesday is the day to roll the dice.”
“Here’s to more closet space!”
“Cubicle 404, YES!”
Then, place the cake in your office’s kitchen area or break room. Put paper plates and plastic forks next to it, and make sure to cut out a slice, so people know that it’s okay to eat. Don’t let anybody see you bring in the cake.