Pranks in horror movies...never a good idea.
Pranks, almost everybody including myself loves them. Let it be letting the air out of a friend's tires, putting pepper spray in the A.C vents, hiding rubber spiders in one's bed, or just jumping out with a hockey mask and screaming bloody murder. 99% of the time, pranks and practical jokes are always a good time.
Unless your in a horror movie.
Here is my top pics of horror movies with pranks gone horribly wrong.
April Fools Day
The house on sorority row