Over the edge

Me: Do you know some people who talk so little that you can't even get to know them?
Sarah: Yes.
M: And you know some people who talk way too much?
S: Yes.
M: It's a fine art to be able to achieve that balance.
S: I'm right on the edge of talking too much.
M: Yes, you are.
S: Sometimes I've fallen over the edge.
M: Yes, many times. But being aware of it is the first step to overcoming it.
S: [silence]