I saw this a long time ago, but I thought it was pretty funny.
It was in the parking lot for the Vet's Hospital, in Martinez, CA.
On the rear engine cover, in a beautiful, large arc, was the word "CONSTIPATED" in large black lettering.
Beneath it was the rest of it: "(Can't pass a thing!)".
I talked with the owner later on, and he told me he'd had it repainted yellow in protest over it's terrible service record - apparently it had been in the shop way too many times for a relatively new car.
Because he wasn't able to get satisfaaction from the Dealer, he elected to advertize against them.
Painted on a yellow VW bug...
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