" Grace, if you have used an iron within the last six months, I will eat that fork," Ms. Chancellor says.
"Which one?" I try to tease. "You've got a lot of forks to choose from."
"From which to choose, Grace. Do not end your sentences in prepositions, dear."
"Of course, I totally see what you're getting at. I mean, at what you're getting. "

― Ally Carter , All Fall Down (Embassy Row, #1)