Petrified...

The teacher is the first person who will open the door. Well, why don't you make a bucket full of egg yolk, glue, water, neon green colorant, boiled sticky tack, your dog's fur and a pinch of love! Make sure to mix well because the glue can get sticked to the bucket... And don't forget to be the second in line! If your teacher always have extra clothes, throw them in a tree so she can't reach it. And by the way, this trick can be very difficult to make if the bucket isn't in the right angle.