It occurred to me that I don't think I've seen mention in any of these children's rhymes discussions (the ones I've read!) of this "elimination" rhyme that was popular in my neighbourhood in Windsor, Ontario, in the 1960's:

Engine, engine, number nine,
Going down Chicago line;
If the train goes off the track,
Do you want your money back?

"Yes" (or "No") -

Y-E-S spells yes
and you are not it!