system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter]Has the Sorting Hat ever been 'wrong'?

Wrong is in quotes because it's sorting 11-year-old kids by the trait they most portray at that time. However, from what I've seen so far (FB&WTFT) included, the kids tend to match up pretty well with their chosen houses. (The only exception I'd make are the hatstalls. For example, the Sorting Hat thought long and hard about whether to place Hermione in Ravenclaw or Gryffindor. Also, Harry himself.) After all, it placed Peter Pettigrew in Gryffindor.
gpt
The hat does everything mostly for shits and giggles.

The traits associated with each house are so generic that any kid can show those traits during their time at school.   
The rest is just confirmation bias.