I need some ribbon wire for my computer lab, so I go to Radio Shack.
I find two spools of ribbon wire, and bring them up to the counter. The guy at the counter starts ringing them up.
"Do you need any batteries?" he says.
"No thanks," I say.
"Would you like a free flashlight?" he says.
"Sure," I say.
He hands me a flashlight.
"Now do you need any batteries?" he says.