Hah! Those were hillarious! Now I am going to tell an april fool joke!
Get a child, friend, or sibling to do this.
First step is to set up a play date with one of the three people. Call the parents or play dates hoster to watch the movie "It" with the child. When the person comes home tell them they need to take a shower because they will be going to a fancy party later today. (if you didnt know "It" is about a freako clown killing people while they take a shower, bath, or just need to take a wiz). There is a scene in the movie where blood comes out of the shower head so you put a few tablets of red dye into the shower head. As the victim is begining to take a shower it will look like blood is spewing out and they will FREAK! The only problem is it is possible to die of fear...
Anyways how is that? I think it is scary enough if I made it make sense.
By the way you have to make the victim see it with someone else so they do not think that you loaded the shower with dye.