Whoa there. John blinks as Ianto turns away sharply, trying to work out exactly what happened. He's used to Rodney snapping back at him, and Ianto making to walk away is so abruptly unexpected he's lost for a second.

"Hey --" he prompts, and sets aside his drink. "It was a joke! Ianto, c'mon --"

He tries to think of something helpful to say. He doesn't care if he can't surf? He doesn't care if he just wants to paddle? It all sounds weirdly disingenuous all of a sudden.