Whenever Anya puts on her ducky towel after a shower, she starts quacking. She likes to experiment with louder and softer quacks as well as seeing if we can get what she's quacking about. It cracks me up every.damn.time. Which is probably why she keeps doing it. For your quacking pleasure, Anya the Duck*:
Taken with the video function on my phone, so please forgive the crappy quality.
*Anyone remember that movie?