Who doesn't like a little challenge? If you do, we suggest you take a look at the visual effect actor and director Paco León shared with his followers on Instagram. His famous friends also noticed the optical illusion.Although Paco León is known for posting funny pictures on his profile, he also uploads photos to get his followers thinking. Not everything is a joke!He's planning his next post... Getty ImagesThis time, he posted an interesting image. If you take a good look at it, you'll see that there's a man in a blue shirt taking a selfie in front of a glass, with another man in the background. But if you look at the whole picture, depending on whether you have a dirty mind, you might notice a rather x-rated optical illusion.Instagram: @pacoleonOne thing's for sure, a sense of humour is an essential life skill. Whether we're having a good day or going through a tough time, a little optimism can't hurt. And Paco León is very much aware of this. Check out the photo in the video. You don't want to miss this!