Start the day two hours later, for the first time in recorded memory. Teachers don't know when to come in. No one knows what the schedule is. Make sure the roads are deadly treacherous, so everyone can arrive sufficiently tense.
Time the delay right after daylight savings time, so that every clock in the school is an hour off. Then, throughout the day, move the clocks forward one minute every four seconds. No one will know what time it really is. The weird sense of being untethered from reality will cause your students to shout throughout the day, "I should be eating dinner right now! I should be home sleeping!" Ha ha! What fun! Why, it feels just like an episode of the Twilight Zone!
Add a new student that day. Poor kid - he thinks he's been thrown into a zoo. Within an hour, he begins to have a hunted look, and to twitch at loud noises.
Next, repeatedly, throughout the day, go on the intercom and summon classes down to the gym to receive a free book. Whoa! Ramp up the decibel level!
But wait! There's more! Now disable the internet, so teachers can't do attendance, send emails, or print materials. Then, (you'll love this) break the copy machine.
Let your imagination wrap around this picture, and you'll get a sense of what it was like last Monday. I'm still recovering. In fact, excuse me - I'm going to go lie down for a while.