Donna turned to the Doctor, an expression of obvious disbelief plastered across her gormless face.
"You have GOT to be kidding me."
"Nope!" he grinned, pulling out an enormous fruity hat from his massive pockets, placing it at a jaunty angle upon his head. "Allons-y!" he said, stroking the TARDIS™ tenderly with his long slender fingers before skipping off up the hill. Donna followed, am-I-bovverd-ly, still clasping the hatbox in her hands, reluctant to put it on just yet.
Donna, wheezing and out of breath, reached the top of the hill some time later to find the Doctor sitting cross legged under a tree, delicately threading daisies together.
"I made you a crown!" he said, obviously very pleased with himself.
"So where are all the hats? The aliens? The buildings?" she asked. Just as the words had left her lips, along came a tall, dark and handsome man, who appeared to be dressed as a cowboy.
"Howdy y'all. How's it going there, partner?" he smiled, raising his eyebrow at the Doctor. Sure enough, perched on top of his lush, thick, black, wavy hair was a cowboy hat, tilted just over his eyes. He was clearly going for a theme, as he was also adorned with a checked shirt, sheriff's medal and spurs attached to his boots.
"Maybe this planet isn't so bad after all," thought Donna. Her daydream was soon destroyed as she turned around to see the cowboy sitting on the grass, playing hand clapping rhythms with the Doctor, who was giggling with glee.
"Oh well," she thought. "If you can't beat them…" she started, reaching inside her hatbox. She pulled out her hat and placed it on her head, and turning determinedly towards the Doctor and his new companion said, "Alright then. Let's do this thing."
The Doctor and his new companion looked over and their attention was immediately drawn to her rather conspicuous hat.
"What?" said the Doctor.
"What??" said the cowboy.
"WHAT?!" they said in unison.