Remember that episode in How I Met Your Mother, where there's a pineapple and nobody remembers how it got there?

Well, a pimeapple appears in 221B and no one knows how.

Wheather or not they deduce how it got there is up to filler.

Can be Gen or johnlock, i'm good with both. Any Genre. Even crossover with HIMYM if you can and want to fit it in.

Bonus: For using john's blog post format.

+ Bonus: if at the end mrs. Hudson makes a pie out of it.