Things.

We at the Institute frequently field queries by telephone as to whether or not we have a certain title.  Invariable, the formula I use when responding in the negative is, "Unfortunately, we don't currently have a copy of ----."

With surprising regularity, I have people respond, "You DO?"

Now, I am generally held to be a passable elocutionist.  I had a bit of a stutter as a child, which will occasionally still surface as a bit of a halting quality mid-sentence, but the speech therapy I underwent to treat it gave me rather a clearer diction than most.  That aside--
Why the ever-loving space pineapple would I say,
"Unfortunately, we do have a copy here for you."

An unrelated pet-peeve:

Customers, naturally, often inquire where such-a-genre section is in the store.
It often happens that male customers especially will ask, I or a coworker will come from behind the counter so as to lead them to it, and they will rush to get in front of us.  They will then stumble around, awkward and confused, because they have no idea where they're going.  They simply must be in front, much like the automobile driver on the freeway who suffers from a burning need both to get in front of you and to slow down significantly.