[Albion Wilde]

I’ve heard of a “courtesy flush” and a “courtesy roll” (window down in the car), but I’ve never heard of a courtesy smell.

That does remind me, however, of a great old joke:

Q. Why do farts smell like they do?

A. So that the deaf can also enjoy them.

[SandRat]

When is a courtesy fart enjoyed most? When the car us loaded and the Fart Dealer controls the windows and keeps them all loaded up. LOL