"How do you do that?"
"Do what?" the Doctor asked, licking marmalade from his fingers.
"Eat ten glasses of jam every day and still keep your stick-like figure! Not to mention the chips you always wolf down... Everyone else would hug the loo!"
"Time Lord. My stomach is capable of much more than that..." He immediately remembered Jackie's food... nothing could be worse than that!
"Then let's make a bet, Mr Impressive. I dare you to eat some of my mother's 'special dish'..."
When the Doctor lost his stomach contents that day, he finally began to believe the impossible...