@Ferris: I've seen Exit through the gift shop and I loved, loved, loved it. So entertaining!
My problem was that I couldn't stop watching, and go to sleep as I should since it was so late. Not sure if my incoming review can persuade you to get back to it. If you stopped watching it I suppose there must have been something in it that didn't click with you, so maybe it's futile. All I know is that it worked for me, which is a bit unexpected because I know nothing about street art and graffiti and had never heard of that Banksy guy before I saw it.