Presentation of the Self

I remember vaguely this discussion with Gideon, Henry, Rene and Adwyn in the canteen one day after school. They (mainly Gideon) were talking about methods of 'talking', but I think it can be generalised to 'presentation'.

Essentially, the argument, or at least the part I listened to, went like this:
When I talk to A, I talk in a way a.
When I talk to B, I talk in a different way b.
When I talk to A and B, I talk in a way c that can be different from a and b.

Interestingly true.