Today I made the mistake of acknowledging that I heard the conversation going on in the lunch room. As they ate, the admin ladies were trying to remember a movie where a manikin comes to life, and I thought I knew one possible answer. I joined in the conversation (while across the room at the sink washing my bowl) saying something I thought might be of interest to them on that topic.
The reply: "uh huh." Then silence.
I somehow managed to hault their conversational progress by participating.