We thought it might be fun to have twins.

It outlines the fact that we are twins, we grew up together, but then we went to different colleges and went in separate directions.

If it wasn't him, they must have been twins.

And when her days to be delivered were fulfilled, behold, there were twins in her womb.

You" or "Your" never meant one of us. When we replied to a question, no one cared which of us had spoken; an answer from one was an answer for The Twins.

Constant togetherness is fine - but only for Siamese twins