2 questions

What did I do to deserve having the cat to climb into my car and use it as a litter box?

A follow up question:

What have done that made me so lucky that the cat peed INSIDE a reusable (yeah, not so much anymore...) grocery sack? Thereby keeping the cat pee safely contained.

And a final insight:

If you are tempted to buy a bunch of those reusable grocery sacks, you could do a whole lot worse than the really big ones that they sell at Costco. They hold your groceries AND evidently, are water tight.

Boo for cats! Yeah for Costco grocery bags!