No need for funky stuff, just do the classic (lol) Young's slits experiment which should be more than enough oddness for anyone.

I was shown it at school, using microscope glass slides that we waved over a Bunsen burner running cold, to coat with soot. We then carefully etched parallel lines with a compass by hand. Our (~17 y/o) efforts were a bit random but we did get some smudgy banding results on the screen.