The Doctor wriggled on the sofa next to Donna. They were waiting to see the man in charge of Buckingham Palace security.
"You could ask that bloke over there where the loo is," Donna suggested, obviously knowing what he was doing.
"Uh-uh, no way!" the Doctor said, determinedly refusing the suggestion.
"Oi, come on, everyone asks. It's a perfectly normal thing to ask for," Donna countered, insisting.
"It's also perfectly private need of mine. End of discussion." the Doctor said stubbornly, and that was the end of the discussion.
A few minutes and a crossing of legs later, a woman came into the empty waiting room. Specifically, the Queen of England. She took one look at the Doctor, and informed him, "the toilets are down that hallway, third door on the right. I suggest you go quickly before you get an infection." Elizabeth the Second advised him, pointing towards a corridor to the left of the man sitting at the welcome desk.
"Right, yes. Thank you, your Majesty," the Doctor said, blushing slightly, smiling at her like if she were an old friend, which she was. He bowed respectfully at the Holy Monarch, then walked to the loo.
"Seat up, Doctor" Elizabeth II reminded him.
"Yes, your Majesty," he replied obediently from the hallway.
"Seat down.. It's as if he forgot the 2 zeroes of his age," the Queen said to Donna, rolling her eyes.
"Yeah!" Donna replied, chuckling, not at all intimidated by the Holy Monarch standing in front of her.
They then had a nice chat about the Starship Titanic, to which Donna remarked "I thought that was a hoax!", with the Doctor joining in with his side of the story upon his return. The End.