"Could happen to anyone," Rose says soothingly.
"Never to me," the Doctor growls. "Superior biology."
"The Empress was enjoying herself. Told me she admired your stamina."
"Pity she waited until after the banquet," Jack said. "It probably was something you ate."
Humans! They didn't understand. If a Time Lord could regenerate from embarrassment, he would have a new face right now.
The Empress had invited him to partner her in the Grand Waltz. The entire Court had witnessed how his body had betrayed him -- an incident made worse by robust Gallifreyan physiology.
It had been a very loud belch.