I thought of a mean prank:
Make a movie called "Cemetery of the Dead." Film a cemetery for 1 1/2 hours with a stationary camera, and add a spooky soundtrack. The film should be in black and white. Other than maybe trees rustling or birds flying through, nothing happens for the entire 1 1/2 hours since they're dead. At the end of the movie fade to black and roll the credits, which are the names of the people on all the tombstones.
I wonder how long someone would watch until they realize nothing is ever gonna happen since it's a cemetery of the dead.
Here's an example title card with spooky letters.
Here's one with more traditional 60s style letters.
Now that I've given away my prank idea I won't be able to trick the 4 people who read my blog.