During high school, I flipped burgers at McDonalds (although, it was during the time when they phased in the clam shell cookers so once they came in there was no more actual flipping). When the McRib first came in, we all collectively decided "that's fucking nasty". Then we saw what the sauce could do. That shit would stain everything. If it stayed there long enough (a few hours) it would even mark stainless steel. No way was I letting it get a chance to do anything to my stomach.