JK Rowling really thought out every single tiny detail while lovingly crafting the "Harry Potter universe." She hashed out the complexities of their mailing system, detailed the course catalog at Hogwarts, and even got us all to understand how Horcruxes work. She also evidently put thought into how wizards poop, and although this delightful bit of trivia never made it into one of the Harry Potter books, it was mentioned on Pottermore, an interactive website for Potter fans from JK Rowling. BuzzFeed uncovered the nugget of knowledge, and now you will never think of Dumbledore the same way again.
Hogwarts’ plumbing became more elaborate in the eighteenth century (this was a rare instance of wizards copying Muggles, because hitherto they simply relieved themselves wherever they stood, and vanished the evidence)...
WAIT WAIT WAIT.
You can't just casually mention that wizards just used to crap their pants rather than using a toilet. What do you mean they "simply relieved themselves where they stood"? So if two wizards were mid-conversation, it would completely normal to see a urine stain growing on one of their pants until it was zapped away? Would no one think twice if a wizard dropped a load out of their cloak before simply saying "Evanesco" to make it go away? And what about the smells? This new information certainly raises a lot of questions.
However, we have to admit, going to the bathroom the "wizard way" definitely would come in handy when you can't find a restroom. Accio, toilet paper!