Useless parts interpreters who tell me I'm wrong when I give them the exact part number of the item I wish to procure.
I used to BE an interpreter, I KNOW what I want, here's the number, order the goddamn part, you glorified shelf stacking number punching keyboard monkey.
However, I DO quite enjoy taking said incorrectly ordered part back to the salesman and inserting it up his most convenient orifice with a dirty big smarmy grin on my face.