Every tourist who visits Pisa, Italy, returns with a photo pretending to hold up the city’s famous bell tower, the Leaning Tower of Pisa. Creating the photo illusion is so popular, that hoards of tourists flock to the town for the sole purpose of snapping the picture. One visitor, however, took it upon himself to walk around the square surrounding the tower and prank unsuspecting tourists. While they stood with arms outstretched, he snuck in, doling out one high-five after another. Watch above to see their surprised reactions.