Yesterday, I was in the kitchen planning dinner, and noticed that the clock had stopped. That really put me behind for my day, so today I decided that I'd better stop at the store for a AA battery.
I found a clerk, and said "Please point me to where the batteries are, I need one in my kitchen."
The clerk asked, "Is it for a clock?"
I said, "I don't know, that's why I need a battery."