I've long followed the custom of writing the date on the chalkboard each morning. When April 1st rolls around though, I remind myself that any teacher who writes April 1st is asking for whatever pranks students dare to risk. I solved that problem by writing March 32nd instead. It's interesting to see how students rarely even notice and will dutifully turn in classwork with that date on it. The fun comes when someone does complain to correct me and I get to say, 'Gotcha'! Happy April Fool's Day, everyone!