April Fools Day

Most of my post reflect fun things that I've done however in math on April fool's day my teacher pranked us in a way that was the opposite of fun.
We had a test that we had known about for a week and our teacher told us it had been moved to the next day. She waited just long enough for everyone to smile before saying " April fools! Clear your desks and take out a pencil."
I can honestly say this experience was the opposite of fun.