#2364: Parity Conservation

[Cueball is standing in front of an oval wall mirror hanging over a small table. He's holding a tube connected to an electronic device. A face is dimly reflected in the mirror.]

Cueball: Listen, I know I said your name three times.

Cueball: But before you come out of the mirror and murder me, can you hold this cobalt-60 and take some measurements?

Cueball: See, I'm researching parity conservation...

[Caption below the comic]:

It took some negotiating, but I've finally become the first person to coauthor a paper with Bloody Mary.