Sadie:

“…Sherlock.”
“What?”
“Don’t ‘what’ me; you know what.”
“I’m certain I don’t.”
“The SKULL, Sherlock. Why is the SKULL in your hat? With one of your dummy’s?”
“Oh, that.”
“Yes, ‘that’.”
“He was feeling left out.”
“…”
“…”
“That’s….oddly adorable.”