Now that's a shame! I am sure it was something as simple as a butt thrown on the ground, but those catalytic converters do get mighty hot. Thanks for the link!
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Looks like it started under the low riding blue car.
You would think the organizers would either wet or cut the grass before turning it into a parking lot.
Hey Ese' when you park your low rider in the grass pump up the hydraulics UP.
I would think the hot exhaust in tall dry grass - easy culprit.