The family put on some Silly Songs a little earlier, just to listen to while we were cleaning, and a certain one gave me a random headcanon:

Bernard was watching one of his nieces or nephews one day, and the kid put in a VeggieTales tape (yes, back when tapes were a thing). When “Love My Lips” came on, Bernard thought it was hilarious (mostly due to his previous experience with all that psychiatric stuff in “Prequels of Love”). He showed it to Maude a little later, but she hated it. Too childish for her very very mature taste, and completely inaccurate (though she knows that’s not strictly true, and he pointed it out).

Now he’ll sometimes play that one song at the house whenever Maude is in the room, just to annoy her a little.