Justice League, Season 2

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So unless the law of conservation of mass has been repealed, there's still hope.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.]