It appears that people are even more terrible at randomness than computers. Usually human ``randomness'' is too uniform. In the following video by Numberphile Simon Pampena has put forward an interesting task for Brady - to write down a series of 20 coin flips. The series wasn't as random as one would reasonably expect. Watch the following video to gain some insights into randomness.
Recall our discussion on the "hot hand phenomenon" earlier? We believe that this might be at least tangently related. Both of these observation could be explained a simple fact that we as humans want to see patterns everywhere. We think that the world has to make sense, it simply can't be random. If we see longer streak of successes we believe that it is not random, though as we have now seen streaks of success indeed can be random.