Well, just so you know, mister old and cranky, I had a good feeling nothing bad would happen.
You really must be old, too old. Do I really get that... Rude when I'm old? That's horrible, I need to lighten up. I don't really like myself.
[There's a sigh before the Doctor gets up, fixing his tie.] Fine. I'll be serious, and I'll be like you. I'll act my age.
'Hello, I'm the Doctor. And I'm old and I don't know how to have fun when I know the universe is not going to explode or implode upon contact with my otherself that I found out by experimentally touching because if I wouldn't have done it, the other me would have.' And don't try to lie, Doctor, if I felt the need, I'm sure it was bubbling up in you as well.