What's behind all of the giraffe profile pictures on Facebook?

(Photo courtesy of John Snell)
(Photo courtesy of John Snell)

Are you wondering why there are so many giraffe profile pictures on Facebook?

These pictures are the result of answering a riddle incorrectly.

The riddle goes like this: "At 3:00 am, the doorbell rings and you wake up. It is unexpected visitors. It's your parents and they are there for breakfast. You have strawberry jam, honey, wine, bread and cheese. What is the first thing you open?"

Here's how it works: Someone posts the riddle on Facebook, challenging their friends to answer it in a private message. If the person gets it right, he or she gets to keep the same profile picture. But if the person gets it wrong, the unfortunate friend must make his or her profile picture a giraffe.

Do you think that you know the correct answer? Scroll down to see if you answered it correctly.

The acceptable answers are "your eyes" or "the door".