The Ancient History of Photobombing
Photobombing is not a modern prank born in the digital age. While the term only rose to fame around 2009, accidental photobombers have been ruining perfectly composed pictures since the invention of the camera.
We tend to think of photobombs as internet-era mischief, but people have been wandering into frames by mistake for over a century. Early photography required long exposure times, making it nearly impossible to avoid someone walking into the shot. What we now call a funny joke was once simply a common consequence of slow technology. Even back then, these unexpected background figures turned formal portraits into unintended comedy.
Source: Photobombing