Here's another one my grandmother taught me.
Opossum Sally
Rail road crossing
look out for the cars
can you spell that with out any r's?
Wave Mouse Over the little mouse To Get The Answer
Nature teaches more than she preaches. There are no sermons in stones. It is easier to get a spark out of a stone than a moral.
~John Burroughs
When high sped trains past each other they must slow down or they will break their windows. The passing trains produce a low-pressure area between them that can actually pull the glass out of the frames.