Literally Choosing His Poison

I deliver chemical supplies. An old man glances into my van as I’m unloading on the street.

Old Man: “You’ve got poison in there.”

Me: “Some of our products are, yes.”

Old Man: “Can you give me some? I’ve got some people who I want to put it in their food.”

Me: “Give me your name and I’ll make sure no one takes an order from you.”