Using an apostrophe in “its” to show possessive is bad, and fairly common in the illiterate set. But at least they generally put the apostrophe inside, um, in The Barn. Like this. First panel. :
Makes me cringe to see that. At least he has the excuse of being a lot of bull (sorry). And it’s photon, not proton, but I digress.
Now when you have the possessive form on a noun that ends in “s,” (such as many plurals) the apostrophe goes after the “s.” You know that, right? Like this:
Both teams’ uniforms were blue.
Okay. So here’s the goof I hardly ever see:
It’s in the last panel, an apostrophe after the “s” in “its”! For shame! —I think maybe the cartoonist wasn’t fully awake. He used “A” instead of “I” in the second panel.
PS—This isn’t even particularly humorous, but it’s on topic:
PPS—and while we’re on this topic, here’s another guy getting it wrong.