My Grandmother’s large Oldsmobile when I was around 6 years old... We were coming back from the vet and I was sitting in the back seat with her large dog. Anyway the dog decided it was time to not only take a shit but pee all over the place. As the dog was sitting in the seat, a bench seat at that covered in vinyl I tried to distance myself far from this sitting, pissing dog only to simply make all of it run towards me when I put my hand down to lift myself off the seat.

 That passes for the most disgusting interior experience in a car I’ve had.