Roger Colbeck gave an interesting public lecture entitled Generating Random Numbers by Winning 'Unwinnable' Games. The video of the lecture is now available online.
Abstract: "I will present some simple games that look, at first (and perhaps even second) sight, to be unwinnable. However, it turns out that whether these games can be won or not depends on physics: while players who exploit classical physics could not win such games, a player well-versed in quantum physics can. I will explain that, as well as saying something truly remarkable about the world, closely related to Einstein's 'spooky action at a distance', winning such games can be put to practical use. In particular, it allows us to certify the generation of random numbers, something that is also impossible in classical physics."