Was riding in my friend’s car and we noticed that the fog on the windows took the form of some sort of document. There was never any document pressed against his window that could’ve left a mark, nor do we know what the document was about (we determined that the header mentioned his car model, but the body of the document was too small and also was printed in reverse so we couldn’t make out anything else). The fog was on the inside of the window, because it smudged if I touched it.
Explain this