The 'Hand on shoulder illusion' meme comes from a snapshot that humorously captures a photobombing incident. It features two women who are joyfully taking a selfie at what appears to be an outdoor event. The twist in this seemingly normal photo is the mysterious hand resting on one of the women's shoulders, which belongs to someone off-frame. This unexpected element adds an eerie but funny layer to the image, playing on the idea of an uninvited presence sneaking into the scene. This kind of visual gag is common in memes for its ability to surprise and amuse viewers by contrasting the women's happy expressions with the incongruity of the phantom hand.