When Savage said Quack, I immediately thought of this Far Side cartoon:
Man: Habla espanol?
Duck: Quack
Man: parlez-vous francais?
Duck: Quack..
Man: Sprichst du Deutsches?
Duck: Quack.
Man: Quack?
Duck: Quack!!
Since I can't find it online... here's two related Far Side 'toons: