So, George is under the impression that the board of directors of the Susan Ross Foundation believes that he killed Susan. Jerry gives him the idea to leave a tape recorder in his briefcase for about five minutes, go back for it, and see what they say about him while he was gone, only to hear, "A low rumple, a metallic squink, a loud galonk, and someone crying out, 'Dear God!'" George then spends the rest of the episode trying to figure out what exactly happened without coming right out and asking them, till he finally reveals what he did in the end, and it was explained to him that one of the directors was moving a chair and dropped it on his briefcase. So, after George leaves again, then we get...
Wink: Does anyone else besides me think George might have murdered Susan?
Director 1: Oh yeah. I just assumed he did.
Director 2: Well of course he killed her.
Wink: Good, so it's not just me then.