rat-a-tat, rat-a-tat-tat = puk, puk (dźwięk pukania)

National Knock-knock Jokes Day

Quelle: http://www.zanyholidays.com/2008/10/national-knock-knock-jokes-day.html

puk, puk (dźwięk pukania)

rat-a-tat , rat-a-tat-tat = puk, puk (dźwięk pukania)