Brows were lifted at Sarah Jane's frustration, just about managing to stifle a cheeky little smirk that was threatening it's way to Jack's lips, and reaching for his glass to hide any escaping smile behind it as he took the occasional sip.

"You're right, how very immature of me," came the mutter from over the rim of his glass, dripping with good humoured sarcasm before he managed to get a grip of his childish amusement.

"Alright then, how about this.. I will promise not to lie whilst answering your next question, however bizarre it may be."