Human Statues, Hilarious Schemes Open Closed

This would certainly be an unusual morning for all Hogwarts students.
Quinn tiptoed down the corridor, the first tentative rays of sunlight falling into the windows as dawn broke. 
There was one thing that the eleven-year-old was infamous for in their neighbourhood, one thing that no one at Hogwarts knew about... yet. 
They loved pranking people.
Thinking up a prank, witty, funny, drawing attention - but always harmless, of course, they never wanted to hurt anyone. 
Executing that prank - the excitement that they were experiencing this very moment. Adrenaline surged through their body as they were creeping through an empty corridor, hurrying down the moving staircases and desperately hoping that nobody would see them before the time came - how would she ever explain being covered in gold spray-paint?
And watching the astonishment, the confusion of the people she pranked, their faces when trying to figure out what was going on, their utter disbelief.
It was going to be hilarious.

The first-year opened the door to the Great Hall, exhaling with relief at noticing that it had not creaked loudly to alert everyone in close proximity, and slipped through. Once inside, they looked around, carefully checking for anyone who might already be in the Hall, but luckily, the large room seemed to be empty. The food was already set on the tables ready for breakfast, presumably by the many house-elves working at Hogwarts: delicious slices of warm, buttered toast, large containers of water, juice, coffee, a small box with tea bags and a kettle of boiling water next to it, white steam rising from it, nearly up to one of the floating candles that magically seemed to never burn down.
Quinn hurried to take one of the buttered toasts, cramming it into their mouth right away, and a glass of pomegranate juice. After all, when the others had arrived here, they would not be able to have any breakfast, completely occupied by their prank.
They wiped some buttered toast from their top lip and licked their finger, careful not to smear the gold paint. Then, Quinn unzipped a thin cotton bag, bulging with the cylindrical object inside, and pulled out a hatbox, also shimmering in the same shade of golden, dermatologically tested spray paint that covered their hair, face, neck, hands, robes and shoes. Checking themselves in a small mirror, they made sure that not a single inch of bare skin was to be seen, before setting the hatbox on the table. It was quite heavy - Quinn had filled it to the brim with stones, making sure that the lid would not collapse under their weight, and creating the perfect plinth for their Human Statue prank. 
They climbed on a chair, leaving a heavy boot's footprint (also golden, of course) and jumped onto the table, plates and cups clinking together as the table shuddered. They stopped dead in their tracks for a moment, anxiously listening if anyone had heard her, had noticed the commotion, was on their way to the Great Hall now - but no footsteps were to be heard in the corridor. They relaxed a little.
Quinn took the bag again, pulled out the aforementioned infamous bottle of gold spray paint, sent by a cousin supposedly to decorate their school supplies.
Well, they had a much better - and funnier - use for it. 
Kneeling down, they sprayed a huge golden circle around the hatbox, which was now placed in the middle of the Gryffindor table, making it seem as if it was leaking. Then, Quinn threw the spray paint back into their bag, placed it on the chair with the golden footprint and pulled the chair towards the table so no one would see their supplies unless they pulled back the chair. 
They hitched up their robes and stood on the hatbox, their hands folded behind the back, a demure expression on their face, looking to the ground. Standing still, at first glance appearing to be a statue, waiting for the first students to enter the Great Hall.