J. K. Rowling owns Harry Potter, and I'm not sure who invented the rubber duck, but I own several. Just saying.
"Avada Kedavra!" shrieked Voldemort, he slashed his wand through the air.
"Expelliarmus!" yelled Harry, flicking his wand in Voldemort's direction.
The Elder wand flew up into the air, and Harry caught it with the skill of a seeker in his left hand.
But, instead of falling to the ground and dying, in Voldemort's place was a rubber duck lying on its side.
A small, pale white, red-eyed rubber duck.
Everyone looked at it in shock.
"What just happened?" asked Ron.
"He turned into a rubber duck, Ronald," replied Hermione.
"I know that, but why- George!" yelled Ron.
"It wasn't me, I swear it!" called George from across the Great Hall.
"You're lying," accused Ginny, who was standing next to him.
"I didn't, really! It must have been.." he trailed off awkwardly, tears forming in his eyes.
"Fred," whispered Ginny. "He switched Voldemort's wand with a trick wand."
"His last prank, the ultimate joke," said George sadly.
Hermione then proceeded to yell, "Avada Kedavra!"
The duck burst into hundreds of plastic pieces, scattered all over the floor.
Everyone, even the Slytherins, knelt down and cried.