Fill a cup halfway with water. Hold an index card over the top of it tight. Flip the cup upside down while holding the card tight so the water doesn't spill. place the cup upside down on your teacher's desk. When he/she sees the cup upside down, no doubt the teacher is going to pick it up. When they do this water rushes out of the cup and onto everything. If you really hate your teacher, use kool-aid and stain everything it touches.