The Arithmancer/Fridge

Fridge Brilliance

Fridge Horror

• Because a ghost's personality is fundamentally unchanging, and their memories of anything other than a few years on either side of their death and the last few years of their existence eventually fade away, this means Moaning Myrtle will inevitably forget that her death was "avenged" and her subsequent cheerfulness will fade away as she reverts to her original personality.

Fridge Logic