Oh does your Jack bring back childhood memories for me! Where I grew up our local pet shop had Soc the Mynah bird. Soc was amazing and had a huge vocabulary! It was a standard Saturday trip to town which had to include a stop to talk to Soc. He was very smart, seemed to understand the reactions to certain words and sounds. He's wolf whistle only at females for instance and seemed to take evil joy in meowing if there were dogs in the store just to get them all going. Poor dear thing got really depressed one time when the store had a very talkative African Grey in and Soc lost the spotlight for a bit. Boy did Soc hate that bird LOL. When it sold, Soc perked right back up. He was a great bird and a huge draw for that pet store for many, many years.