TARDIS pranks.

Warm water cascaded down Amy Pond's back. Her slender body flexed as she luxuriated under the pounding jets of the TARDIS shower room, enjoying the heat and the pressure, massaging alien shampoo into her hair. The TARDIS had its fault, but at least it provided one of the best showers in the universe.

"Alright, TARDIS," she said aloud. The shower was voice-controlled. All you had to do was ask the TARDIS for what you wanted, and it would oblige, supposedly. "That's enough. You can turn it off now."

Nothing. The water continued to pummel her body, as hot and soothing as ever. Amy rolled her eyes. "Come on, you stupid machine. I have adventuring to do."

When nothing happened, again, she kicked the walls and said "Hurry up! We haven't got all day, you know. Aren't you supposed to be all-powerful or something?"

She heard a light buzzing sound. Then all the water shifted at once from hot to freezing cold.

"Eek! What... what are you doing! Stop it at once, you pile of junk!" Icy jets blasted her face, sprayed her nipples, played over the sensitive place between her legs. She hopped up and down, cursing and kicking the walls. "Damn it! Turn it off! If you don't stop now, I'm telling the Doctor!"

The water stopped.

"That's better," Amy said crossly, wringing shampoo out of her hair. "I'm watching you, TARDIS. You'll have to be quicker than that if you want to put one over... hey, why won't the door open?"