My McD bad day was pulling the shakes off the mixer (they were still mixed in my day) early and putting a horizontal pink stripe across the distric supervisor's shirt.
I was sentanced to the lobby for 5 months.
When I was there the fries were still cooked in beef tallow, man were they good!
We had a softserve machine with a notoriously phinicky gasket, man what a mess that thing made... about twice a week until the new gasket finally got delivered.
The fries tasted so much better when the grease had some beef fat in it.
It's funny now to walk into a McDs and see how little of the equipment I recognize, and all the new stuff on the menu. Actually the new menu items are nice, I pretty only order stuff I never cooked.