It's only tangentally related to black holes, but this reminded me of a demo/small game I once played. For people interested in messing with relativistic speeds and the weird stuff that happens with light, I suggest giving http://gamelab.mit.edu/games/a-slower-speed-of-light/ a go. It's a game developed by MIT that simulates a downscaled speed of light, so you can play around with relativistic effects, like red/blue shifting and perspective warping.