Like the title says....
I'll start:
A lady walks into a diner and sits at the bar. Waitress comes over and she orders a burger and fries. She sees the waitress hand the ticket to the cook through the pass-through window and is totally grossed out when he starts to patty the burger using his armpit. About to puke, she flags her waitress and says scratch the order, she's leaving. The waitress sees the cook making pit patties and replies "You think that's disgusting? You should show up at five in the morning and watch him make donuts!"