Mettaton stops dead in his tracks, looking at Frisk like they suddenly grew a second head.

"I cannot believe the amount of build up you gave to a pun. Now I know for a fact that those who say you don't have a sense of humor are lying."

He can't believe it. Then again, he of all people should understand that how someone acts in the public light can be very different in comparison to how they act in private or semi-private settings.