[It's true that some people can arrive after they've died... and it actually isn't quite true, for L. It's complicated, with his last memories, the mirror taking him, and then confirmation of future events from a successor three years older than he was the last time L saw him.

He rolls his eyes, taking a deeper sip of whiskey.]

Wow, that really clears everything up. Or would, except that you can't have sex with Clippy, either. Or fall in love with it, unless you're looking for a very specific kind of grammar-related pillow talk. For the sake of argument, I don't think there's actually an appropriate comparison, given how "really advanced" the SQUIP is.