Jack frowned at the inside of the coffee shop. It wasn't at all like the Doctor to be late and, frankly, it worried him. Maybe he had found the TARDIS without Jack's help and had departed to places and times unknown. Brow furrowing, Jack surveyed the people around, wondering if (perhaps) there was a new Regeneration and if he was staring at the Doctor without knowing it.
No, Jack knew he would recognise the Doctor no matter what.
Bumped into from behind, Jack turned just as the Doctor recognised him. God was that man a sight for sore eyes. "Doctor!" Jack said, grinning, throwing his arms around him.