On break at home from freshman year at college my friends and I were driving around (too young to drink, too old to sit in a basement playing video games) looking for something to do. My friend (the genius attending one of the nations best engineering schools) says "hey! Its April 1st! Lets prank someone!" To which we all heartily agreed
It was decided we should do some sort of prank on our old high school, and label it as a "Senior prank" to point suspicion on others.
We stopped by a store for supplies and then headed to the school. We smeared "SENIORS RULE!" on the principals office window in peanut butter. We did a few other things that escape me, but the best (worst) was yet to come.
We had decided to "poop" on the school. The original plan was for one of us to leave a little pile on the doorstop with a little flag in it. We had forgotten that the door area is pretty wide open with no cover from passing cars (cops!) and on lookers. Luckily there was a fairly large bush some 30 feet away which would conceal us. I volunteered first. I went behind the bush and using a plastic bag that covered the days newspaper I "deposited" the item, carried it over to the doorstop and left in front and center.
Next one of the guys went behind the bush, "deposited" his and began to make his way to the door, but stopped. Without warning he spun the bag like a slingshot and launched the missile at the door. It landed with a (oddly) heavy THUD and stuck about 2/3 the way up the door.
This was met with obvious surprise and laughter. We quickly created the flag that read "April fools / Seniors rule / here's some poo" and stuck it in the first pile.
We high-tailed it out before we go caught and waited for stories to filter to us through our friends (we told NOBODY). As far as we can tell no one mentioned it, and the story was a secret to everybody but us.