I can remember waiting at train crossings when I was a young boy. We had to cross two sets of tracks within a half mile of our home and we would have to wait sometimes a good while for the train to pass.
To help pass the time Dad would always recite a short riddle that I still remember:
Look out for the cars!
Can you spell that
Without any R's ?
And of course the answer is yes ..... "THAT"
Oh.... for the good ol' days. Next time you are waiting for a train with young-uns try this riddle on them .