I really can't help it.

This is meant to point out the inherent smart-alecky quality I have that I can't really get rid of.

At work last week, a woman was looking at the coffee bins and asked the following question:

"Where is the Sumatra from?"

Now, in my mind I kind of know what the answer is that she's looking for, but before I can answer, I give her a very matter-of-factly answer:

"Sumatra."

She scoffs a little, looks at the tag which contains the answer she wants, but was too lazy to look at in the first place, and goes away. Works for me.