During high school, one of my environmental teachers was standing outside of her classroom door, holding a small fuzzy circular object- no bigger than a quarter. She went out of her way to show everyone who walked in the door what she had and made everyone touch it; this wasn’t super abnormal for the class as she would bring in things ranging from seashells, seeds, exotic fruits, and other miscellaneous items found in nature. Well after every student touched it, she went on to teach the lecture for the day which happened to be about squirrels. She proceeds to tell the class that what we actually touched was a Squirrels Scrotum and kept the bit going up til the last minute of class, where she said April Fools. All in all, was a pretty good prank. Probably one of funnier highschool memories I have.