My mother used to keep a magnifying mirror in the upstairs bathroom that she used. One day she came home and was furious with us all for burning the bathroom door. Sure enough, there was a streak of burnt wood across the outside of the door in a straight line across. Her theory was that we had been fooling around in the kitchen, got something WAY too hot and went rushing upstairs to throw said item (cookie sheet perhaps?) into the bathtub. We all denied such charges vigorously! It took us some time to realize that the sun was coming through the window, reflecting off the magnifying mirror and thus burning the wood. The straight line was created as the sun moved across the sky. :huh:

:chky:
Carolyn