Yeah, I hear you, it's not something you really expect, ever...
Here's that YouTube clip:
Two observations - the way she sings "mumps" is one of those things that comes out of nowhere, hits you upside your head hard, and then is gone by the time you gather your senses enough to look for it: & I think she more than adequately bedazzled Heffner, beating him at his own game. She had him eating out of her hand!