A: Can I borrow a knife?
B: What do you need it for?
A: What do you mean?
B: What you need it for will determine which one I give you.
A: How many knives do you have?!?
B: What do you need a knife for? -- FightingFit
"No, no, no," said Human Arin. "I gotta go down this rabbit hole. How many knives do you own?"
"One for every purpose and then some," dismissed Human Bob. "I have a collection."
"That's not a number."
"Dude. Just tell me what you need the knife for. I'll get you the right tool for the right job."
"I want a freaking number now. Okay? You got a knife for that?"