Toilets
Several rooms with toilets were specifically mentioned in the books.
Fred and George Weasley had never "blown up a toilet," but they offered to send Ginny a Hogwarts toilet seat [PS/SS6]. Harry, Ron and Hermione took on the mountain troll in a girls' toilet - the location was never specified, but it was probably on the first or second floor [PS/SS10]. Fred and George did send a toilet seat to Harry in the Hospital Wing, but Madame Pomfrey confiscated it [PS/SS17].
Moaning Myrtle haunted a girls' toilet on the second floor [first floor in US edition] [COS8]. This room was a gloomy and depressing bathroom with a large, cracked, and spotted mirror over chipped sinks and flaked, scratched wooden doors to the stalls [COS9]. Hermione brewed the Polyjuice Potion in a cauldron perched on a toilet in this room [COS11]. Ginny threw Riddle's diary into a toilet, and Harry found it in this room [COS1]. Moaning Myrtle had been killed by the basilisk in this bathroom [COS16]. The sink in front of her toilet had a tiny snake scratched on the side of one of the copper taps - this was the entrance to the Chamber of Secrets [COS16].
The toilets at Hogwarts emptied into the lake, which probably irritated the giant squid and the merpeople, and also made it rather inadvisable for students to swim in the lake for recreation or as one of the tasks in the Triwizard Tournament [GOF25].
There was a boys' bathroom on the seventh floor near the Room of Requirement; Harry wanted to head for it after the DA were betrayed [OOTP27]. After Fred and George stuffed Montague was stuffed into the Vanishing Cabinet, and he didn't reappear until some days later, crammed into a toilet - no location mentioned [OOTP28].
In a girls' bathroom Hermione overheard a dozen girls, including Romilda Vane, trying to decide how to slip Harry a love potion [HBP15]. A few days before a Quidditch game, Ron kept running into a bathroom to throw up. Harry overheard Draco crying and talking to Moaning Myrtle in a boys' bathroom on the sixth floor. Draco saw Harry, and they dueled with drastic consequences [HBP24].
The Room of Requirement can also act as a bathroom; when Dumbledore took a wrong turn in the castle with an "exceptionally full bladder," he discovered that it had turned itself into a room with a collection of chamber pots, though he did not recognize the full extent of the room's ability [GOF23].
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