None this year, but I did one last year on my boss. He had just come back from a seminar with another employee here (named John), and while they were gone John took a picture of my boss sleeping in the car with his mouth open. He emailed me the picture, and I saved it on my boss' computer as his background. Then I had the screen saver saying APRIL FOOLS! haha my boss is pretty computer illiterate, so he had no idea what had happened