What would we do if there weren't two of us?

I suppose there'd be only one.

No, no, I mean, wouldn't it be strange? Just one of me and one of you, and not having the other there, too?

Contrariwise, having two of us means we've got to look out for one another.

Yes. You always do get into things and I'm the one who ends up having trouble.

What? It's you who gets me in trouble!

Nohow!