A computer cannot do random (on it's own), that's why it has pseudorandom in the name, it makes you *think* it's random when really it isn't, it's possible to ensure that the results you get from a pseudorandom number generator are exactly the same every time (i.e. you start the generator, write down the first 1,000,000,000 numbers, restart it and the same 1,000,000,000 numbers come up), which is a bit like having the same lottery numbers this week, next week, the week after and the week after that.

If you wanted true randomness you could use the keyboard/mouse/controller movements of a user to generate a random value which is then applied, so, I've no idea where I'm going with this except that SE's random isn't actually.... random, it's a fixed system of numbers which can be generated again and again and again.