Random?

I was having one of my classic random (haha(you'll understand the dry comedy later) conversation with my dad I was debating with myself to him the existence of randomness.

Think is it really real? When your creating a "random" pattern you know your thinking what looks best together and computer's randomness is always created by a complicated mathematical pattern. All nature is pattern and it is possible imagining the world in pattern. Closing your eyes and picking some thing there is still the connection between your mind and hand and other senses choosing the direction or thing you like best.

So is it possible to be random?
Or have just merely defined our idea of randomness wrong?