A complaint was received by the Pontiac Division of General Motors:

"This is the second time I have written you, and I don't blame you for not
answering me, because I kind of sounded crazy, we have a tradition in our
family of ice cream for dessert every night. After we've eaten, the whole
family votes on which kind of ice cream we should have and I drive down to
the store to get it.
I recently purchased a new Pontiac and since then my trips to the store have
created a problem. You see, every time I buy vanilla ice cream, when I start
back from the store my car won't start. If I get any other kind of icecream, the car starts just fine. I want you to know I'm serious about this
question, no matter how silly it sounds: What is there about a Pontiac that
makes it not start when I get vanilla ice cream, and easy to start whenever
I get any other kind?"
The Pontiac President was understandably skeptical about the letter, but
sent an engineer to check it out anyway. The latter was surprised to be
greeted by a successful, obviously well-educated man. He had arranged to
meet the man just after dinner time, so the two hopped into the car and
drove to the ice cream store. It was vanilla ice cream that night and, sure
enough, after they came back to the car, it wouldn't start.
The engineer returned for three more nights. The first night, the man got
chocolate. The car started. The second night, he got strawberry. The car
started. The third night he ordered vanilla. The car failed to start.
Now the engineer, refused to believe this man's car was allergic to vanilla
ice cream. He arranged, therefore, to continue his visits. And toward this
end he began to take notes: he jotted down all sorts of data, time of day,
type of gas used, time to drive back and forth, etc.
In a short time, he had a clue: the man took less time to buy vanilla than
any other flavor. Why? The answer was in the layout of the store.
Vanilla, being the most popular flavor, was in a separate case at the front
of the store for quick pickup. All the other flavors were kept in the back
of the store at a different counter where it took considerably longer to
find the flavor and get checked out.
Now the question for the engineer was why the car wouldn't start when it
took less time. Once time became the problem -- not the vanilla ice cream--
the engineer quickly came up with the answer: vapor lock. It was happening
every night, but the extra time taken to get the other flavors allowed the
engine to cool down sufficiently to start. When the man got vanilla, the
engine was still too hot for the vapor lock to dissipate.

Moral of the story: even insane-looking problems are sometimes real.