( CNN ) -- If you 've spent any time on Facebook in the past day or so , you may be wondering : What 's up with all the giraffes ? Are they suddenly endangered ? Is the circus in town ? Is Toys R Us having a sale ? No , no and no . ( Although depending on where you live , the circus may actually be in town . ) Photos of the spindly , long-necked animals are the byproduct of a meme that 's been sweeping the social network in recent days . The meme invites users to share a riddle with their friends , who then are supposed to send a private message with the answer ( do n't post it in the comments , obviously ) . Any user who guesses wrong must agree to change his or her profile photo with one of a giraffe . Why a giraffe ? It 's not clear . CNN iReport : Who is talking on Facebook about giraffes ? The riddle goes like this : . 3:00 am , the doorbell rings and you wake up . 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 ? ( Spoiler alert : The answer is at the bottom of this story . ) Most users agree there are two acceptable answers , although given that Facebook is an unruly community of 1.2 billion people , there 's some debate over that . Judging by some comments on Facebook , some users are growing tired of the giraffe riddle . Others are making jokes . `` If anyone shows up at my house at 3 am they had better get a hotel because I 'm not answering the door , '' wrote one commenter on CNN 's Facebook page . Said another , `` I got it right , but the giraffe pic cracked me up so I made it my profile pic . '' Then there was this commenter on the Chicago Tribune 's Facebook page : `` Truth be told ... upon realizing it was your parents you 'd probably open the wine first . '' The answers : `` The door '' and `` your eyes . ''
A new Facebook meme asks users to answer a riddle . If you get it wrong , you 're supposed to replace your profile pic with a photo of a giraffe . Score: 6