As far as optical illusions go, here's one that will make you snigger into your hand and hastily avert your eyes.
Just a hallway, nothing to see here
What's that, you can't see it?
The image was originally posted to Imgur, where mucky commenters suggested the artist follow up by adding an animated hotdog being thrown down it.
One simply remarked: "The internet has ruined me."
Hat tip to Jezebel for flagging it up.
And while we're on the subject, here are 16 other unintentionally sexual optical illusions. *Snigger*