Reid got spicy with the UnSub's father in "The Uncanny Valley".
Reid: These girls are what, like nine... nine or twelve years old, I'm assuming?
Doctor: My PhD is on the effect of trauma on prepubescent girls. I do not appreciate what you're implying.
Reid: Oh, I'm not — I'm not implying anything. I'm making an inference. An inference is an educated guess, and based on that, I form a hypothesis. For instance, my hypothesis here is that after you raped your daughter, you submitted her to electroshock treatments to make sure she stayed quiet.
Doctor: ...This is outrageous.
Reid: And then, out of guilt you bought her toys... more specifically, you bought her a line of dolls. Because that's what serial molesters do, they give gifts. So you continued the pattern with your other patients, and then once they left your care you added their toys to your collection.
Doctor: I'm sorry. You can't back up your story... *Doctor*.
Reid: This is why I love my job, *Doctor*, uh... because my lab, it's a jury of your peers. My tests will be Jenny Larson, Abigail Moore and Linda Kraus. The DA will put them on the stand and I'm gonna personally bring these dolls in and we're gonna watch how they react.