Don't know if this is the most stupid thing I have done, but it is not one of my brightest moments. Years ago, before I got older and started to know "stuff" as CaptJerry mentions in an earlier post, I had a couple heavy duty full restaurant grade cooking sheets. Over time, using those sheets they developed a pretty good "seasoning on the surface". As hard as we tried we could never "scrub" those trays to be clean down to the surface again. I got the bright idea to turn my gasser grill up to full heat, and put the pans on the grill "seasoned" surface down directed at the flames to burn them clean. Good thing only one would fit on the grill at a time. I put the sheet on and left it for 30 or more minutes. I should have remembered some of my chemistry classes from school. When I went to take the tray off, yes it was now clean down to the metal, but the extreme direct heat changed the composition of the metal. It actually became much more flimsy, warped, and pretty much unusable. Now that I am older and know "stuff", seasoning on those pans, my cooking stones, cast iron skillets, cooking grates etc. is a good thing. Yep, we all learn, sometimes the hard way.