I was playing around online and came across this oldie but goodie.

Here's the deal:
Problem - Warm Beer
Solution - Use the external cooling of a liquid gas tank to cool beer through the rapid utilization of liquid gas such as would be the case if you had say, a jet engine....

Check this out for further details: http://www.asciimation.co.nz/beer

This still makes me chuckle.

Enjoy.

- Scott

me and some mates had the same problem of warm beer at the beach one day. we just buried the beer in damp sand at the water's edge. we thought we were pretty smart, but i can now see our methods were primative and overly efficiency conscious for the real task at hand.