granted, this probably didn't go beyond the scope of what they were programmed to do, but it's still freaky nonetheless.
10 robots were given points for how often they went for "food," a light-colored ring on the floor vs. "poison," a darker ring at the other end of the space. the robots had blue lights that went off randomly but gave away their position. there were only 8 spots near the food, so they had to compete for the spots. the robots who were the best at finding food went on to the next round. after 50 rounds, the robots started deceiving each other by not emitting their blue light so as not to give away their position when they were near food.