Some of my colleagues never clean their keyboards. When I see the buttons covered with a layer of dust I'm afraid to touch them. And one crazy idea came to my mind. Why not tricking them on the forthcoming April Fool's Day? It will be funny and give them a very good lesson.

So when they were having lunch I went out of the building and picked up some grass. I brought it to the office and stick several blades into every dirty creature's keyboard. When my colleagues came back they were shocked to see their keyboards like that. And I was sitting and laughing at them and saying: "You are April Fools, even the dirt on your keyboards grew up to show you what dirty creatures you are!"

Then my colleagues started laughing with me and the April Fool's Day turned into the Cleaning Day. And from now on every year we trick on each other on this day and then clean the office because some trick leave much dirt after them but not as much as my colleagues' untidiness.