We're not saying we invented this prank. But we haven't seen this one before (maybe we don't get out enough?), and we just had to share it.
We love this partly because it's so devilishly simple. Here's how it goes:
Enlarge the chimp picture above. Then using your cell phone, take a picture of it.
Then when you are with that special someone, take a close up picture of him or her. Then instead of selecting the picture you just took, select the chimp picture.
Show your victim the chimp picture, instead of the actual picture you just took.
Run from the angry outrage, while laughing at the top of your lungs. If the person catches you and threatens you with physical harm, just blame Mad Lab Productions.