This is chapter 17 of Chris Martenson's Crash Course. It is only 17 minutes. It explains Peak Oil clearly and concisely. I recommend watching the entire Crash Course. It will take three hours and twenty minutes, but you can watch it in pieces.
Martenson has been helpful regarding the basics of economics and how money works and tying that to energy and ecology.
Here is a 45 minute summary.
And now the 17 minute section on Peak Oil, your midnight movie: