Dear Mr Green Topaz driver

Dear Mr Green Topaz Driver,

Because you're not aware of it I wanted to let you know something. Your windows are not tinted. They are clear and completely see through. Therefore, I was perfectly capable of seeing you digging voraciously in your nose on 71 north this afternoon.
My question however is, what on earth was it that you dug out of your nose and why was is so fascinating?

Sincerely,

The curious and concerned silver Camry driver.