I have a similar story.
In my wild youth, I had both an afro hair do and a mini cooper.
The person I bought it from was restoring it, but had the wild idea to remove the external seams between body panels that stuck out perpendicular to the body. Removing them made it look really nice.
But the seam between the roof and the the rest of the body is also the rain gutter.
I was replacing the weatherstripping, and of course it needed to come from england, and of course it would take 6 months.
So my friends and I were out driving in the rain, and the water came down the roof and right inside the car, unimpeded by any silly rain gutter or weatherstripping.
Now the carpets were soaked… but a Mini is a pretty compact car, so the exhaust pipe runs in a narrow central tunnel, and it was heating the floor… enough to create steam/fog inside the car.
So the cop sees a strange little car driving down the street, with what looks like a solid block of smoke inside, and it’s got 4 long haired hippies inside.
He was very perplexed when we all seemed normal (except for the hair), and I had to have him stick his head inside to see the steam rising from the carpet… he thought he had a drug bust and all it was was a steamy microclimate in a tiny car.
Greg