Create a list using Alexa's built in "create a list" functionality and name it after one of your friends or family member (e.g. Max). And then add any phrase you want to that list so Alexa can quack that back at them!
Note: The list item has to be unchecked for Alexa to quack about it.
Workflow: "Alexa, create a list" > say [name] > add items for [name] > "Alexa, quack back" > say [name] > Alexa will pick a random item from one of your custom lists titled [name]