9. A new use for tin foil.

You know all that money you spent murdering out your Honda last year? Coachella will be the three days of the year when you regret that decision as the sun magnetizes through your car windows. In an effort to keep your cooler's stash cold a bit longer, you deodorant from turning into soup and the rest of the contents of your car from melting, tin foil up those windows. Your efforts will not result in a nicely chilled sedan, but it will make a difference.