You may have noticed something strange in your Facebook feed. Your friends are now giraffes. John Smith is now a giraffe. Aunt Sally is now a giraffe. That weird guy from the office is now a giraffe.
What's the deal?
It is all part of the Great Giraffe Challenge. The Great Giraffe Challenge is simple. Answer a riddle correctly and you can keep your profile picture. Answer it incorrectly and you have to set your Facebook profile picture to a giraffe for three days and repost the riddle to your friends. Started by Andrew Strugnell, the Great Giraffe Challenge already has more than 70,000 likes on Facebook... that's a whole lot of giraffes.
Try your luck at the riddle by going here. But if you're wrong... prepare to be a giraffe for three days!
Oh, and for the record... Rich Dool is now a giraffe.
Watch Andrew's video below.
Follow Rich Dool on Twitter @RichDool