If Sherlock could have gone more pale, then he would have. What did he already remember?

"As a child, your imaginary friend was Hades?" He asked, trying to sound incredulous. "That seems like a pretty odd friend to have. I've heard that the only people that see him are the people who are about to die. I've... studied the gods a bit." he smiled. It wasn't a lie, really.

Sherlock finished his beer and got a second, not wanting to seem like he was trying to get John drunk, though he really kind of was.