I’ve had this mirrored stereoscope for many years, but now I’m modifying it so I can strap it onto my face.
Obviously you could make your own out of cardboard, plastic or whatever ejects your seat, baby, but you have to use front surface mirrors.
Watch this video with your favorite stereoscopic viewer or look at it in 2D by placing your hand over one eye. :/
You can also download this video with your favorite YouTube video downloader (search for the best ones available, e.g., “4K Video Downloader” and “Best Video Downloader”), then use a freeware media player with stereoscopic 3D and 2D viewing options:
…or you might have your own that you prefer.