How truly random is randomness?

[somethingillremember]

Have you ever seen a friend do something strange, and thought, "Well that was random." ? Or someone mentions randomness and you instantly think of pie?

But think about it for a second. How can one be truly random? The two things I see as being possible are either that everything in the universe is predestined, or that humans and other living things can make choices that alter the course of things. If everything in the universe really is doomed to follow things out exactly a certain way, then nothing can really be random. Something can be seen as "random," that is, something that happens out of the ordinary and as far as we can see had no reason, but deep down, it was predestined that way.

Or, if humans really are able to make choices in life, than everything that we do would have to be some sort of decision, weather conscious or not. And can a decision be random? If you made a decision, your mind would have had to be referencing something somewhere in it's memory certain things required to make that decision. So even if a decision seems to be made randomly, the decision must be in reference to something that the person had done or seen before, because, at least as far as I have seen, the human mind cannot just get ideas out of nowhere.

What I'm trying to say is that things cannot be causeless (as in, caused by something, not done for a cause), and although causelessness is not necessarily part of everyone's definition of "random", I think to be truly random, something would have to be causeless. But the question is: can something truly be causeless? And if not, does this prove that everything is predestined?