Synopsis: Liz begs John to remove the hay rake because she doesn't suck her thumb anymore. He'd rather not do that yet (tinka-tinka-tinka) because it's a bad habit (tinka-tinka-tink) and bad habits are hard to (tink-tink-tink) break.
Summary: They're even harder to break when you act like a bag of pus like John and confuse "giving a shit about other people's feelings" with "being muzzled."