Disclaimer: I own nothing of Harry Potter. No profit is gained from writing this.
Pranked!
The great hall was empty when they made the drop. Placing the contaminated batch of 'Bertie Bott's Every Flavor Beans' in front of Professor Snape's seat, Harry quickly made his way back to the other accomplices waiting by the door. They had been plotting for a good year, watching the antics of the Headmaster as he delivered his routine gifts to the other staff. Snape had always received the customary beans and, just to please the headmaster, ate a few promptly after.
Christmas morning came and as the students still remaining at the school came down for breakfast the Gryffindors watched not so subtly as the Potions master made his way toward his seat. The beans, which happened to all be snot flavored, sat waiting to be opened. With baited breath the children watched as Snape eyed the package, glanced around the hall and sat to open his gift. No longer caring whether or not they were caught they all stared openly when Snape lifted a small hand full of beans to his mouth and chewed. A horrified gasp and several gagging noises were heard when they watched Snape smile widely and eagerly grab for more beans.
Harry couldn't remove his eyes and grimaced while watching the dark haired man eat, and eat. Ron could be heard trying to stop from puking, and Hermione could only mutter a small, "Gross!"
There was something off about the way the Headmaster had delivered his gift. The beans sat on the table, awaiting his arrival, but each year he was bombarded by Dumbledore's excited smile and the present was thrust into his arms. This wasn't right; all the other staff had not received their gifts in the same fashion.
Swiftly walking to the table, Snape felt many eyes upon him, scanned the hall quickly he spotted all the little Gryffindors trying to be sneaky in watching him, and failing miserably at it. Taking his seat, the Professor felt as the Headmaster deftly passed him something from under the table when walking by. Seeing that it was his gift of 'Bertie Bott's Every Flavor Beans', Snape eyed the package sitting on the table. With the passing of a Professor in front of the table, Snape deafly switched the packages.
Snape could see the children as he picked up the box, practically falling out of their seats with anticipation. Taking a few of the beans from the box, he ate the harmless candies and smiled slightly. As the horrified looks crossed the student's faces he couldn't help but smile wider and make a show of eagerly eating more.
END.