Sherlock Holmes (about Toby, the dog): Keep up, he's fast.

(second later...)

John Watson: He's not moving.

Sherlock Holmes: He's thinking.

John Watson: He's really not moving.

Sherlock Holmes: Slow but sure, John, not dissimilar to yourself.

John Watson: You just like this dog, don't you?

Sherlock Holmes: Well, I like you.

Mary Watson: He's still not moving.

Sherlock Holmes: Fascinating.

Mary Watson: Oh!