The Doctor had been staring at the seatbelt sign for the last two minutes. The plane had yet to take off. Donna rolled her eyes at the Doctor.
"See, this is why I told you to go before the plane."
The Doctor stopped staring and pretended nothing was wrong.
"What are you talking about?"
"Oh, stop pretending. I've seen you stare at the seat belt symbol for two whole minutes. It's not gonna turn off faster the more you stare at it." Donna replied.
"Well, my bladder only announces itself every 3 days. When I said I didn't need to go, I really thought it'd last." the Doctor remarked in slight complaint.
"And that's why 'needing to go' shouldn't be the only reason to go to the loo. You can't predict a bladder that wizard!" Donna argued.
The Doctor nodded in agreement. He really shouldn't be so stupid about it. In 900 years of traveling, he had yet to develop any kind of effective schedule.
Few minutes later, the sign turned off. The Doctor thanked Rassilon and went off to the loo.
He wasn't sure upon entering, why Donna hated airplane bathrooms, but he did make a note of the size. Including the size of the bowl.
He unzipped, got into position, focused his aim, and started urinating. He sighed in relief.
One thing the Doctor would come to hate about airplane bathrooms was lack of turbulence proofing. The plane started bumping wildly, sending the Doctor's stream splashing a bit on the seat and floor. The Doctor cursed in Gallifreyan and English. He finished, washed his hands and went to get some toilet paper to clean up the two small puddles of his urine that were now where they very much shouldn't be. But there was no paper. Slightly panicked, he called Donna.
'Doctor? What's wrong?'
'Donna! Do you have any tissues in your bag?' he asked nervously
'Yeah,'
'Could you bring me a couple? It's an emergency!'
'Sure' Donna replied.
Slightly confused, Donna went towards the bathroom and handed the tissues to the Doctor. He cleaned up and got back into his seat.
"So, you're gonna tell me what happened or what?" Donna asked, wanting answers.
"Turbulence. Caused a slight... Spill." he explained.
"You missed the bowl?" Donna said, adjusting his words.
The Doctor nodded. "Seat down?" Donna guessed. He nodded again.
"Sorry, should've told you, you need the seat up, 'cause of the turbulence," Donna remarked apologetically.
"Well I'll definitely have to keep that in mind if we're gonna go on a plane again.." the Doctor replied, blushing with embarrassment.
Donna stroked the Doctor's back and smiled, then helpfully changed the subject.