So, how to get revenge on someone by using their bathroom? If you have access to their bathroom, there are many ways to get even.
This is actually an old revenge technique. What you do is take a dump in the upper part of the toilet where the water loads each time. It causes quite a stink if your enemy doesn’t notice it for awhile. For me, the only thing that gives this tactic away is the color of the water that runs through the toilet when you flush it. If your enemy has just a little brains, they’re going to know that they should open the lid on the back of the toilet to see what happened.
The Improved Upper Decker (created by me)
Use anything dead (mouse, rat, frog, etc.) and dump it inside the water container on the toilet. Try to use something that isn’t too big, because it might clog the opening where the water escapes to the toilet bowl. The long they don’t discover this, the worse the smell will become.
The great part about putting something that is already dead is because it will probably be even grosser for them to remove.
On the other hand, you can also use live mice (if you are not squeamish) and dump them in there. This could even be funnier if your enemy discovers them while they are still swimming around in there. For better results, put one inside the toilet bowl so they will quickly discover it. This will add double shock when the others are discovered in the water deposit in back.
These are just examples, you can think of other animals to put in there, too. Just use what is available. As you can see, there are multiple ways on how to get revenge on someone quickly.