When I was a tech and when I ran shops, I used to kid, whenever I could, with the vehicle customer. I would do an inspection for the problem and then build the estimate with the diagnostic fee, parts fees, labor fees and any tax if required. Inevitably the customer would say, "Is this the total charge?" I would tell them that because we were in a rust state or even here in Eugene with no rust to deal with, that as long as we ran across nothing else during disassembly that would be the total and the only other charges would be if there is blood. My exact words at that point would be, "Blood costs extra". The double take and blinking of eyes by the customer at that phrase was very funny. I would break in to a shit eatin' grin and have to tell them it was a joke but I also added that some vehicles just did not want to "give up the ghost" unless blood was drawn. It is what it is and part of the job sometimes.