Have you noticed that some of your friends on Facebook have changed their profile picture to a picture of a giraffe? The Giraffe Challenge has officially gone viral on Facebook, and here's how it works.

One of your Facebook friends will challenge you to solve a riddle. If you decide to play along you must not answer the riddle in the comments, you must message the challenger with your answer.

If you answer the riddle correctly all is well. But if you give the wrong answer, you must replace your profile picture with a picture of a giraffe for three days.

This is the riddle:

It’s 3am, the doorbell rings and you wake up. Unexpected visitors!! It’s your parents and they are here for breakfast. You have strawberry jam, honey, wine, bread and cheese. What is the first thing you open?

Before you try guessing which food item to open, look closer at the question. Your guests are outside, would you open the door first? The doorbell rings at 3 a.m. and you wake up. Could the answer be your eyes?

Leave what you think is the answer in comments below.

If you haven't seen enough giraffe pictures on Facebook here are a few more

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