I'm in my office and a student comes in and says to me, "Hey Mr. Yamamoto, I had an accident in shop class" as I had my back towards him. I turn around and see this bloodied kid as he yells, "April Fools!" I about had a heart attack. The blood looked so real, it took me a few minutes to regain my composure. Good times. Best April Fools prank pulled on me ever.