Going back to that weather forecasting rock...I remember, a couple of years ago, my friend and I did a cross-country flight as part of our flight training. We landed on one of the smaller airports N-W Ontario. So, after landing, we went to check-in. On our way to the main "terminal", my buddy and I saw that rock. Never having seen it before, both my friend and I stood there for a moment, just reading the "legend".
The rock earned a chuckle from me (it was a stressful day, btw). But the comment made by my friend made me cry. Picture a straight A student who is a really, really smart guy (not just book-smart - a really high IQ). That guy made the following comment:
"Yeah, but that thing just tells you the current condition...it can't forecast anything!"
The moment he said that, he paused, and then it hit him. By that time, I was already on the ground.