"And I was like," the woman was saying to her husband before they were interrupted by a wheezing noise. Turning, they jumped to see that a bizarre blue box had materialised in their bedroom. They quickly pulled the duvet up to cover their naked bodies as a strange man wearing a tweed jacket and bowtie emerged from the box.
"Mr and Mrs Bieber," he handed the couple a foil package, "for the good of humanity, please use this condom. We wouldn't want you to have a baby!"
"Baby?" the perplexed couple repeated.
"Baby!" confirmed the man.
"Oh!" they intoned in comprehension.
The man grinned and ran back inside the box, which promptly disappeared whilst making the same wheezing noise.
"There," the Doctor said to Amy back in the TARDIS, "I've just prevented the greatest evil in all of human history."
"But Doctor," Amy complained, "you promised us an adventure. It's Friday!"
"Friday?" the Doctor asked.
"Gotta get down on Friday!" explained Amy.
"Oh," sighed the Doctor, "there's that evil as well. Sometimes I regret having stopped the Silence. They wouldn't have allowed these things to happen."