If Heiji ever got a stuffed animal, maybe he'd give it to Snake.

"You mean it was something you repressed because you couldn't deal with it at the time?" Heiji crossed his arms. "Yeah, that's more than possible. I mean, the brain is a pretty imperfect medium. It creates false memories, gives you back information you thought you'd forgotten all about at times when you least expect it..."

And more pertinently -- "It might give you back the memory of when the accident actually happened. If you were awake for that. Of course, that's not just in regards to you. It could just as easily apply to anyone who's had a traumatic event."