"Crash, bang, wallop," went the TARDIS™ and the people inside it.
"AAAAAAAAAAAAH!" screamed Donna, clinging to the TARDIS™ control panel as she was flung from side to side. "Make it stop, spaceman! You alien nutter! What's it doing?"
"She's making space love to me. And I like it." The Doctor winked at Donna, whilst apparently enjoying the vibrations reverberating through the TARDIS™ floor.
"Oh. My. God. I'm stuck, in a spaceship, with a horny Martian. You have GOT to be kidding me!" she said, with a disgusted look on her face.
Suddenly the TARDIS™ reached her climax and came to an abrupt halt. The Doctor stood up and patted her interface lovingly. "Was that good for you?"
The TARDIS™ made an affectionate crooning noise, whilst swooshing her swoosher (that big light tubey thing in the middle). Donna made for the exit, making sure to keep a good distance from the panting and flushed Doctor. He followed her outside.
"Come on then. Tell me. Where have you landed us this time?" Donna asked, impatiently.
"Here, you're going to need this." The Doctor retreated into the TARDIS™ and came out clutching the ridiculously large hatbox that Donna had brought with her. He thrust it into her arms.
"What?!"
"Welcome to the Planet of the Hats!"