This is an interview between Neil DeGrasse Tyson and physicist Brian Cox in which Brian explains to Neil that lightsabers actually could bounce off each other, despite being made of light (previously Neil argued they would just pass through each other with no interaction). Then they whip out two plastic lightsaber replicas and try to beat each other senseless. Just kidding, that's only what I was hoping would happen. It's like that Rolling Stones song -- you can't always get what you want, but if you try sometimes you just might find, you get the exact opposite, and that is life, the end.
Keep going for the video and learn science.
Thanks to n0nentity, who wants a hula hoop shaped lightsaber.