Taking things literally. Literally.

At an arts festival a few weeks ago, this lady came up and told me how much she liked my dress. Obviously joking, I said "thank you - my job here is done!" And then she asked what I did for work. I answered, but noticed she seemed perplexed. I realized that she thought I literally meant "my JOB" when I said "my job here is done." Um, it's a very common phrase...