I was driving down the road yesterday and the tiny car next to me had a LARGE St. Bernard dog riding shotgun in the front seat. He was sticking his head out the window and as they drove his jowls were flapping in the wind. Not gross yet, you say? The window just behind the dog was covered with large quantities of dog drool which flew from his mouth as they were driving.
Not exactly high on the gross scale, but could have been less than pleasant if you were behind them, especially on a motorcycle.