"Look," Rose said as she took clothes out of the washer and loaded them into the dryer, "I don't care that the sonic will clean your clothes, you need to use the washer and dryer."
The Doctor looked decidedly put out. "I don't understand why. The sonic gets them just as clean, and I save water. Saving the planet, Rose! Environmentally friendly and all that!"
Turning the machine on, she turned to him. "Are you afraid of the washing machine, Doctor?"
"No!" His answer was entirely too fast. "Me, afraid of a household appliance? I'm insulted."
She knew she'd hit the nail on the head. "Then tell me why you haven't used it. Tell me why instead of using this perfectly good washer that my parents bought us, you insist on using the sonic." She knew all too well why he refused to use the washer; last time he had, he'd shrunk her favorite sweater, bleached her favorite jeans, and turned all of his pants pink. After she got over her initial anger, she'd had a good laugh at his expense, and he'd finally just gone out and bought more pants to keep her from laughing.
"I told you, environmentally friendly."
"Or you have a mortal fear of wearing pink pants." Rose couldn't help but laugh.
"Oi! It was an accident! You didn't tell me I couldn't wash all the clothes together!"
"Big Time Lord brain and you couldn't figure that out?"
"Time Lords didn't do laundry."
Clearly upset, he started to walk out of the laundry room to go have a good sulk when Rose stopped him, grabbing his hand. "Hey, look at me."
The Doctor turned to look at her, and a pang of guilt shot through her when she saw just how badly she'd wounded him. "I'm rubbish at this, Rose. Big, huge, Time Lord brain and I can't even do my own laundry."
"You're not rubbish," she replied, putting her arms around his neck and leaning in to gently rub her nose against his. "You're not. It's just gonna take some time." Giving him a coy smile, she began to play with the hair at the nape of his neck as she pressed herself into him. "Besides, there's one very human thing that you are very, very good at."
The Doctor raised an eyebrow as he slid his hands down to her bum. "And what would that be?"
They never told anyone how they ended up with a huge hole in the wall behind the washer, or how the washer got that rather large scrape and the dents. And the Doctor never complained about laundry again. In fact, it soon became his favorite chore.