Both the chandelier and the candelabra on a rickety table nearby were shaped like serpents.
The silver doorknocker was in the form of a twisted serpent.
Harry crossed the dingy landing, turned the bedroom doorknob, which was shaped like a serpents head, and opened the door.
’I wanted to have it chewing up a serpent to represent Slytherm, you know, but there wasn’t time.
The smoke serpent, however, split itself instantly into two snakes, both coiling and undulating in the dark air.
No, of course not,’ said Mr Weasley, with a slightly bitter smile, ’the Ministry wouldn’t want everyone to know a dirty great serpent got —’
After a few seconds, the tiny puffs became a steady stream of smoke that thickened and coiled in the air… a serpent’s head grew out of the end of it, opening its mouth wide.
With a look of grim satisfaction, Dumbledore gave the instrument another gentle tap with his wand: the clinking noise slowed and died and the smoke serpents grew faint, became a formless haze and vanished.
— CHAPTER NINETEEN — The Lion and the Serpent Harry felt as though he were carrying some kind of talisman inside his chest over the following two weeks, a glowing secret that supported him through Umbridge’s classes and even made it possible for him to smile blandly as he looked into her horrible bulging eyes.
For a moment, it seemed Dumbledore had won, but then the fiery rope became a serpent, which relinquished its hold on Voldemort at once and turned, hissing furiously, to face Dumbledore.
He felt dirty, contaminated, as though he were carrying some deadly germ, unworthy to sit on the Underground train back from the hospital with innocent, clean people whose minds and bodies were free of the taint of Voldemort… he had not merely seen the snake, he had been the snake, he knew it now… A truly terrible thought then occurred to him, a memory bobbing to the surface of his mind, one that made his insides writhe and squirm like serpents.
…the last few weeks of summer, but while Ron crawled into bed and was asleep within minutes, Harry sat fully clothed, hunched against the cold metal bars of the bedstead, keeping himself deliberately uncomfortable, determined not to fall into a doze, terrified that he might become the serpent again in his sleep and wake to find that he had attacked Ron, or else slithered through the house after one of the others… When Ron woke up, Harry pretended to have enjoyed a refreshing nap too.