I live in a place where trains pass by often and they’re usually carrying coal.

If we see one while out and about, I’ll ask those with me, “do you know kind of train that is?”

And then I sing, “A coooooooooooal train!”.

I’ve done this many times and will do it again, I’m sure.

(Source for those too young to get the bad joke: https://www.youtube.com/watch?v=NB8PPhQglwo)