As a matter of fact
Meaning: actually, in addition to what has been said, in reference to what has been said, used to emphasize that something is true, especially when it is surprising
Example: As a matter of fact, I used to live next door to him. As a matter of fact, John came into the room while you were talking about him.
Example: As a matter of fact, I used to live next door to him. As a matter of fact, John came into the room while you were talking about him.