That's not a trick photo -- they didn't have Photoshop in the '20s. They had scissors, glue, and markers. They couldn't pull that off. But just in case you still don't believe it, here's some footage of Laurello for you.
In fact, according to Laurello, anyone could do what he did -- all it took was pushing his head farther and farther every day for three years, until he could ogle his own butt. Although the fact that he had a dislocated spine to begin with probably helped a bit. But Laurello possessed more than one talent. He had to. He made his living as a performer, and his whole head-rotation schtick lasted, what, about 4 seconds?
So he began making accusations about audience members' mothers and their activities in Hell.