Mark: Where’s the Book of Common Worship?
Me: I think I packed it.
Mark: Wait, it’s sitting right next to you.
Me: Oh, you mean that Book of Common Worship. I thought you meant the Book of Common Order. I definitely packed that already.
Mark: No you didn’t, it’s on my chair.
Me: Oh. I guess it was the Book of Common Prayer. One of them. I’ve definitely packed a few of those.*

* Yes, we have a few. One or two are actually mine.