When you do as much flying as I have recently, the oddest things can catch your attention.
I was stretching on a flight recently and noticed the following on the door of the lavatory:
That's right, there is a standard "no smoking" sign at the top, but at the bottom of the door, there is an ashtray! An ashtray!
Either that plane was built a long, long time ago, or somebody really fouled up.