Yes, I know what you mean.. I have had mine for 17 years, and boy, they can scream, quack, do the "Ack Ack thing", etc..
What I do is squirt him with water, and he stops... I mainly spray his wings cause then they will spend time trying to get it off..LOL
You can talk to them too... They like sooo much attention, and are drama queens...
good luck with the quack..
Tracey