Another favorite Finster sound is when Tea or Earl Grey sing their Hunka Hunka Burning Love song from inside a nest box. Very sweet. Speaking of nest boxes, male Zebra finches have a call they make when they find a good spot for making a nest. One of my first finches, a male Zebra, sang this little song from inside a nest box he had just discovered. Wonderful! Sounded a little like R2D2 when C-3PO threatened to leave him alone on Tattooine.

I've read that many parrots like to "play" with sounds, and will make their usual vocalizations while under bells, or other objects that change the tone or sound of the calls.