@Lateralus. What did you cook for dinner anyways? You're leaving us hanging!
Do you always let these kinds of interactive opportunities escape?
Perhaps next time you could make some lemonade, i.e. Give the person the following look
Then slowly, very slowly, say:
Why..... yes..... I am.....
Then break out the creepiest smile you can muster.
Be sure to take a mental photograph of the person's reaction as well as any nearby onlooker's. Enjoy at your leisure.
That'll teach em