Trying to find an iconic Grey “..what?”

Occasionally Brady would be telling Grey a story, often involving some sort of odd social situation, and Grey would exclaim “..what?” almost outside of his control, at the audacity of whatever Brady’s passerby was doing or saying.

There’s one in particular I’m trying to find. I can hear it in Grey’s voice and it made me laugh. But I can’t remember what the story Brady was saying was, just that it is NOT the one in Stunt Peanut.