Alfred and Batman in “Unfinished Business”

Alfred

I'm afraid it's time, master Bruce.

Batman

I'm not going to the funeral.

Alfred

[surprised] Why?

Batman

Because he's not dead. What tipped me off was the lack of evidence.

Alfred

Sir?

Batman

[showing the table of debris] I brought all this from the crime scene, and I've examined it every way I know how.

Alfred

And you found?

Batman

Absolutely nothing. No scorching, no residue, no radiation. Objects were here, then they were gone.

Alfred

I'm afraid I don't understand.

Batman

Matter can't be created or destroyed, just changed from one form into another.

Alfred

As you say, sir. I believe I heard something about that when I attended grammar school.

Batman

So unless the law of conservation of mass has been repealed, there's still hope. [As Toyman's weapon was technological, not magical, the laws of physics must apply.]