On one of the last few weekends of the 2009 summer, we came up with the fantastic idea to attempt to bake cookies in my car using the heat from the sun and the vehicle's heater. This idea became even better when it became a challenge between ourselves to see who could stay in the vehicle the longest.

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Though it was quite warm out on the day we chose, if we had a warmer day I'm sure we could have reached temperatures in the 70C range. The maximum temperature we were able to achieve was 62C, which being from Canada, is pretty damn hot (eh).
Being a fairly spontaneous event, we didn't do much planning ahead. None of us thought to wear shorts, and our drink of choice wasn't doing much hydrating.
The cookies weren't a total success, but they weren't a failure either. If the temperature had been higher, or we waited a little longer, I am very confident that the cookies would have hardened and tasted just like the ones that would come from a real oven.