mystery photos

Do you ever find when you go to save your photos onto the computer that there are some mystery ones that you know you didn't take?

I wonder who might have taken these photos??
Any guesses B3?

And yes this photo is upside down- so the camera must have been when the photo was taken.

You find yourself asking why?
Thank goodness with the advent of digital this is no longer wasted film and one can simply delete.