Add a few drops of food coloring to the toilet – For some extra April Fools Day fun, why not fill the toilet bowl with something like cooked spinach or mashed potatoes?
Put sticky notes all over the sink, mirror, and toilet! Everyone is bound to be surprised when they enter the bathroom and find it covered in reminders.
Place Pop- Its (those little harmless firecracker noisemakers) under the toilet seat to surprise someone with a loud popping noise as they take a seat on the throne.