Pink :: I bow to the master...
After reading about all your April Fool's fun we seem pretty tame/lame around here.
In college we used to trick the guys in other apartments with our "homemade chocolates". We would cut up Ivory soap into small chunks and dip it into melted chocolate chips until completely coated. Then we would tell our intended victims that we had just learned to make candy and this was our first batch. It was funny (and mean) to watch them bite into the soap and chew it and figure out a way to tell us that it tasted awful. And really there is nothing more awful than soap stuck in your back molars.
I also have a vague memory of visiting my sister in collage as a child and they snuck into someone's room and pulled off the fitted sheet on their bed and poured Rice Krispies on the bed and then put the fitted sheet back on and made the bed. Entirely new meaning to Snap, Crackle and Pop. I personally would not want to clean that one up later.
In the past I have made good use of a rubber cockroach we have. (hee-hee Allison) At work we used to pop the keys off computer keyboards and switch them all around. And someone stretched Cling Wrap over an office doorway so you walked right into it.
Every year Little Think stuffs Mr. Think's shoes with tissue paper down in the toe so he can't get them on all the way. Gets him every time. We have to put it into several shoes since we never know which pair he is going to wear.
Good times, good times...
Happy April Pink :: Think