Charlie's comment on the cartoon was this:
"...I noticed that manager at a local Denny's restaurant using some sort of thermometer gun to measure the temperature of the griddle, frying cooking oil, soup pots, salad compartments, etc.
I wonder if that could be used "before" and "after" aimed at a bare bottom?"
That started me thinking. Perhaps you could use a thermometer to test for hotness, and use technology to tell when a spanking was "well-done". After some research on my favourite kitchen supply site, I found a few thermometers that might do the trick.



