So someone calls to ask whether or not we could refill his printer cartridge. I ask what kind, he says "HP." I ask "ok, what number is it?" and he reads off some long number- part number maybe? No idea.
I tell him that the ones we refill are all 2 digit numbers, so maybe there's a number like that on it somewhere?
He says, "well, it's a laser printer..."
... I tell him that's ok, we just need to know the big numbers that are probably on top of the ink cartridge itself.
He asks: "oh, it's... an.. ink cartridge?" - which makes part of my brain shut down so I can answer him nicely, because that part of my brain?
Is busy hollerin' "What did you THINK we were gonna refill it with, LASERS???"