#700: Complexion explain

I get frustrated trying to judge whether acne creams are having any effect. In the spirit of a controlled trial, I used one on just half my face for a few weeks.

[A graph shows pimples vs. time, with two lines: one remains steady, and one is declining.]

It was cool seeing the effects so clearly, so I got some friends to try different treatments in an impromptu study.

[Cueball looks in a mirror, sees a half-pimpled face, and applies a treatment.]

[Cueball is talking to Ponytail and Megan, each with some pimples also.]

Cueball: Okay, you try the salicylic acid first.

Ponytail: Wait, we should randomize the trials. Got a coin?

Cueball: Okay, call it. Heads, she gets the-

(Off-panel): YOU!

[Batman runs into frame and punches Cueball. The coin goes flying.]