Hidden Last Supper Parody Oil Painting!

I was working in a vacant unit and found this nice oil painting of a horse. I decided to take it home and it sat in my living room corner for over a year, one day my father came by to see me, and I showed him this picture and he turned it over. He noticed there was a few tears in the paper on the back (the picture was a little bit beat up when i found it in the unit). He says to me, "Whats under here?" and he proceeds to tear the paper on the back while i was shocked at what he was doing telling him to stop damaging it. and when the paper was removed it unveiled this picture of the last supper except, instead of jesus and his deciples it is men in business suits watching a dogfight with a judge in jesus's place.

Im very interested to hear what this picture means or what its value is.