My first expedition into the dubious realm of Doctor Who fandom. Be afraid, be very afraid.
One shot drabble. And we all know the trouble with chameleon circuits...
9th Doctor and Rose.

The Trouble With Chameleon Circuits.

"Damn it! Stupid thing!" The Doctor kicked the metal box hard, wincing as he bruised his toe.

"Doctor…"

"Not now Rose! Come on, just let me in…"

"Doctor, we need to leave…" The blonde hopped from one foot to the other as she kept watch. Today's source of untimely death was the fast-moving blob of gelatinous slime that was headed straight for them. Technically, it was the Urgothor of Haveskan, but Rose didn't really stop to ask it its name after it swallowed the first person whole.

"Yes, can't you see I'm trying?"

"Then try harder!" she snapped urgently.

"I knew it was a bad idea! Now, where do I keep the spare…"

"Doctor!" Rose exclaimed as the blob reared its, well, its something. Head possibly.

"Yes, OK! I get the message – and, hup!" The Doctor felt along the rim of the box with his fingers and flipped the hidden catch, catching the key as it fell into his hand. "Voila!"

Moving swiftly, he moved aside the brass numberplate on the British red letterbox, inserted the key, turned it and flipped open the lid/door.

"You first." He said, turning with a quick flash of a grin. Hitching up her voluminous skirts, she stood carefully on his linked fingers and climbed into the TARDIS. With a little wave and a grin to the creature, the Doctor quickly followed her, hoisting himself in and pulling down the flip top lid.

In the control room, Rose paused a minute to straighten her dress.

"A letterbox?" she exclaimed as she saw him enter and run down to get them away from the immediate danger.

"It's not my fault," he retorted, running half-way round the console to flip another switch, "It's the TARDIS."

"Yeah, yeah, blame the time machine." Rose replied, storming off to change back into her beloved jeans.

"Damned chameleon circuit." The Doctor muttered under his breath as they left space and time. "Thing needs reprogramming. Now, where did I put that hammer…"

The End
Note - No Tardii were harmed in the making of this fic. I can say nothing for peculiarly working chameleon circuits however. Suffice to say thatthe TARDISdidn't remain a letterbox for long. Happily, it soon returned to it's usual state.
No gelatinous aliens were harmed in the making of this. Only one mentioned person, but he died of natural causes - a heart attack brought on by the stress of being eaten alive.
FireOpal