PIC: This holiday photo looks extremely inappropriate until you look closer

You just got to love these optical illusion photographs. If it's not an extra limb in a photo, it's a limb being mistaken for something else.

The latest optical illusion to go viral online is of a couple sitting on a boat while on holiday. Seems innocent enough, right? Not at first. The woman's friend shared the image on Reddit saying, "My friend posted a new profile pic with her boyfriend, and everyone took a double take..." Have a look. What do you see? If you don't see what the big deal is, focus on the man's head and you may see the photo in a new way. Still not seeing it? You will definitely see it in thumbnail size. One person commented on Reddit,

"At first, in the thumbnail I thought he was totally naked. then I realised that was his hand. Then I clicked it and realised it was her legs. Then I went back to the thumbnail, and I thought they must've done that intentionally. Then I clicked it again and realised they didn't. This post has been an absolute emotional rollercoaster for me."