Daddy: Stop sucking your thumb.
Daughter: hmmmph (sad face while she reluctantly takes her thumb out of her mouth)
Daddy waits a second outside of the door, while daughter waits a few seconds to make sure daddy is not watching. He peaks his head back in, notices she hasn't put her thumb back in her mouth and commends her on her obedience and her effort.
Daddy: Great job not sucking your thumb
Daughter: I don't really want to suck my thumb anyway Daddy (with such a mild mannered tone you actually believe for a split second she's serious)
Daddy: That's great sweetie, daddy is proud of you.
Two minutes later I walk by the room, her thumb blatantly shoved in her mouth and she's sucking on it so hard her eyes are scowled and her cheeks are moving so fast it looks as if she's about to suck the thumb right off. "Better get that thumb out of your mouth, daddy's coming!"