Giraffe riddle, a new phenomenon that has arrived to Facebook, is making people to feel like they are nine years old again.

The emerging trend on Facebook has people changing their profile picture to a giraffe image after they fail to solve a complex riddle.

"It's 3 am, 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?" one riddle reads.

Facebook users who fail to solve the riddle, must change their profile picture to a giraffe image and repost the riddle asking for the answer via private message.

The Giraffe riddle game has gone viral in Facebook and even making people feel it is some sort of virus that is trying to take over accounts.

If you want to know the origin of the game, check out the next video, which reportedly is the source of the whole game.

Now, still not knowing the answer? Google it!