What sounds like a duck, acts like a duck but is not a duck?

We went to a family reunion yesterday and it was a combination Courville/Hebert reunion. There were a lot of my uncle's Hebert (A-Bear to you non-Louisiana French people) family there that we didn't know. A lot.

At one point, my sister Bonnie pointed to the front of the tent and said, "Oh, my God, that Hebert woman over there laughs like a duck."

I said, "I heard that earlier. That's not a duck?"

"No! It's that woman!" Bonnie laughed.

We all laughed. Then, Bonnie decided to imitate the woman and laughed like a duck.

I said, "Great, Bonnie. Now, Uncle Jay's family on the back side of the tent is pointing over here and saying, 'Oh, my God, that Courville woman over there laughs like a duck."