Cave Of Forgotten Dreams (2010) - 6/10
This is a documentary about how 40,000 years ago a bunch of pre-historic Banksys decided to graffiti cave walls with pictures of animals, rather than, amazingly, cocks and balls. And about how those images are still giving old men erections to this day. It shows that we haven't really changed all that much in that time; we just use Sharpies as our tools and the back of toilet doors as our canvas.