When they answer this question, my experience is that the answer is "it's a trade secret." Even when you start with, "look, the only way to get this number is

When they answer this question, my experience is that the answer is "it's a trade secret." Even when you start with, "look, the only way to get this number is by scraping it from my online resume --" "I'm sorry, that's a trade secret and I can't tell you where--" "No, look, I don't care, but take me off your list." "Oh. Right."