The History sometime can be so cute. One of the earliest examples of photobombing: Daguerreotype portrait of an unidentified man holding a book with another man moving into frame behind him, c.
[daguerreotype occupational portrait of an iron smith with his tools] via Harvard University’s Houghton Library, Department of Printing and Graphic Art, Harrison D. Horblit Collection of Early Photography
[Daguerreotype] “I had no portrait, now, but am small, like the Wren, and my Hair is bold, like the Chestnut Bur – and my eyes, like the Sherry in the Glass, that the Guest leaves – Would this do just as well?”
From the submitter maidith Daguerreotype of Charles Des Voeux, taken in He was an officer aboard the HMS Erebus, one of the ships of the doomed Franklin Expedition.