Remind me to explain the concept of a 'joke' to you sometime.
Remind me to explain the concept of a ‘joke’ to you sometime.
...
Sorry, I did not realize it was a joke. Had I been able to see your face as you said it I would have understood that it was humor. (I am a woman, so maybe I had my hissy girl sensors out; usually women don’t crack on other women — to their faces, at least — unless they know them. Men, OTOH, say all sorts of outrageous things to each other, and no one is offended. One of the many things that I admire about guys.)