Ok, so Harry Potter conspiracy theory time

it-grows-perhaps-the-greater:

Boggarts are produced by emotional trauma.

Ron and Harry hide in the wardrobe in the Hogwarts Staff Room after learning that the monster in the Chamber of Secrets is a Basilisk. They overhear McGonagall telling the staff that Ginny had been taken into the chamber by the heir, and the heir had written “Her skeleton will lie in the chamber forever” onto the wall. Ron’s younger sister was almost certainly dead. She had been taken into the Chamber of Secrets to be the prey of a giant snake that can kill people simply by looking at them. He’d seen her grow up beside him, watched her first steps, seen her ride her first broom, and now she was gone. And he learned about it standing in that cupboard. It must have been his worst fear come true. Then, the next year, a monster appears in that cupboard, feeding off the fears of everyone around it.

Then, the next boggart we see lives in the writing desk in Grimmauld Place. That place was full of traumatic moments, but I think that the boggart was created when Walburga Black realised that Regulus was missing, and probably dead. She had two sons; one she disowned for parting from his family’s beliefs. The other was her pride and joy, her youngest child, the only heir of the pureblood House of Black. And then, one day he goes out and he doesn’t come back. The house elf knows something but he can’t tell her. I think her grief and anger and fear over the realisation that not just one, but both her sons were now lost to her is what created that boggart. I think she sat at that desk and wrote letters to everyone she ever knew asking if they had seen her son, and that boggart was created when her worst fear came true. Her son was gone and he was not coming home.

Both were created when someone’s worst fear came true. Both were created when somebody lost a loved one. Because isn’t that everyone’s worst fear?