Can anyone think of something fun to do with my stock cooler?

Splice in a 9V battery, install in a baseball cap, and sell as a high-tech solution to watching baseball in August.

Paired with a T-Shirt like this . . .
http://www.thinkgeek.com/tshirts-apparel/unisex/generic/a69c/
it might even make it as a style statement :)