Longer ago than I care to remember
This was on the first film I took with the first real camera I ever bought (Canon EF, now residing somewhere in Brasil)
The camera had a special button that you would press while you are advancing the film forward, which would keep the current frame in place, so you could take two photos on the same frame. That was exciting!!! I think I only used it a few times though, and I am sure I had a good reason.
So, as my first "trick" photo, I took a picture of some clouds and then a picture of some palm trees.
Who needs photoshop?
The scan turned out a bit grey. Maybe that's when photoshop comes handy.