Sherlock Holmes stalked around Baker Street. He peered into every corner, lifted every cushion, and displaced nearly every item to examine them. John Watson ignored him for as long as he could, but finally put down the morning newspaper and watched him openly.

"Holmes," he ventured after a minute or so, "what on Earth are you up to?"

"It is the Fool's Holiday, Watson," Holmes murmured. "I am looking for anything that is out of place or has been changed. I will not be made a fool this year."

Watson grinned, glancing at the calendar and seeing it was, indeed, the first of April. "Mrs. Hudson will be pleased that you haven't forgotten her fake seat prank from last year," he observed. "It clearly made an impression."

"It was my backside," Holmes grumbled, "which made an impression on the carpet after I fell through the false chair."

"You did leave a mark, didn't you?" Watson replied with a little laugh.

Holmes grunted unhappily. "Why should there be a day every year dedicated to making me do extra work just to live my life?"

"Oh, come now, Holmes. Mrs. Hudson never does more than one prank, and she gives me the same treatment. There is no grand conspiracy against you, or have you forgotten that last year I walked around the whole day with 'April Fool' written in chalk on the back of my jacket?"

"You have no right to complain; you're not innocent in all this, Watson," Holmes snapped.

"I never prank you!" Watson defended himself.

Holmes leveled a glare at him.

"Well, not on Fool's Holiday," Watson amended his statement with a smirk. "I leave that to Mrs. Hudson, who always does such an admirable job. I only pull your leg when you deserve it, and don't you pretend that you never give as good as you get."

Holmes finally smirked a bit as well, then sighed. "Well, well, I suppose I'm not above having a bit of fun poked at myself every now and again. In any event, Mrs. Hudson doesn't seem to have sabotaged anything around here and so I may sit without falling to the floor like last year. We will have to keep a sharp eye out though Watson, for she is tormenting me by saving the prank for later. I will only relax my guard at lunchtime."

"There's nothing to be done until there is evidence of foolery afoot, Holmes. Come to breakfast; I've been sipping my coffee and waiting for you to be done with your prank hunting for ten minutes now."

Holmes sat, and Watson happily poured more coffee and began to spread jam on a scone. Holmes took a scone, too, and covered it in marmalade. They bit into them almost simultaneously, and almost simultaneously spit them out. White powder flew everywhere, as if it had begun to snow indoors.

Holmes and Watson looked at each other in confusion, both of them coated in flour from their heads to their laps. Watson picked his scone back up, peering into it before beginning to laugh. Holmes looked as well, and pulled an empty paper pill box out of his own scone. It had been filled with flour and then baked into the breakfast item, waiting for someone to bite in and explode the flour all over themselves.

Mrs. Hudson must have been spying on them, for they could hear her laughing softly from below them, clearly pleased to have gotten both of them at once.

For the prompt from trustingHim17: Watson, Holmes, or Mrs. Hudson plays a prank on one or both of the other two. Who did what to whom?

Note: False seats, trick foods, and writing on someone's coat with chalk were real 'Fool's Holiday' pranks. Pranks were supposed to end at noon, which is why Holmes was so paranoid in the morning.