Reporter Slings Epic Insult to Colleague...On Air!

Lots of colleagues banter back and forth at work. Now imagine you're On Air together during a LIVE, local news broadcast. You make a comment, and your colleague responds with an EPIC insult, and says it with a straight face! Furthermore, it makes for a somewhat awkward moment and you can't really respond!! Was she serious? Was he embarrassed? Was it all in good fun?