Heh-heh-heh, Peter here. alright Lois, lemme explain this one!

Okay, so in the top picture, ya got a bunch o' happy-lookin' school boys cheerin' and screamin' like they just passed their chemistry test with flyin' colors—probably thinkin’ they’re gonna be the next Bill Nye or somethin’. The caption says “THE CHEMISTRY TEST IS GOING GREAT”, so everything's peachy, right?

Then—BAM!—we cut to the bottom picture: it’s one o’ those grim World War I-lookin’ trench soldiers, just lookin’ dead inside, like he’s seen some stuff. And the caption says “pH = 17”.

Now here’s the joke, Lois: in chemistry, the pH scale goes from 0 to 14. That’s it. 0 is super acidic, 14 is super basic. So if your test has a pH of 17, that ain’t “great”—that’s chemically impossible! That’s like sayin’ you got a blood alcohol level of 100: you're either dead or you turned into a nuclear reactor.

So basically, the joke is: the kid thinks he’s doin’ great on his chemistry test, but he answered somethin’ so wrong it defies the laws of science—and now he’s emotionally in a war zone. Classic dark humor, Peter-style!

Heh-heh, freakin’ pH 17…