How to explain Peak Oil to anyone

Sharon Astyk wrote this piece for Grist's blog (Gristmill) a few weeks ago. I read it and forgot all about it, getting side-tracked by visitors and gardening. I thought I'd post a link to it here today for a few chuckles. For instance, she writes:

If the person is a lot like Homer Simpson:

The way to explain it is: "Beer comes from oil. You use oil to run tractor to grow barley. You use oil to run fermenting equipment. You use oil to ship beer to liquor store. You use gas, made from oil, to drive drunk to the store to get beer. No oil means no more beer -- ever."

The solution you offer: More beer good. Beer comes from oil. Must. Save. Beer.