If anyone finds out how to stop absent-minded tooth whistling, or humming/singing/whistling 'Just One Cornetto, give it to me, dah dah ad duhduh, dah dah da-dee' please let me know. My father in law who doesn't have dementia has been doing this for years and it drives me batty. He doesn't even know he's doing it and he certainly doesn't know any of the words.