Toilet and outhouse jokes are one thing, but an open latrine hole without even a tree for cover seems more revolting than warranted by this joke. Besides, that “lid” is much larger than any trapdoor spider could possibly build. Even allowing for comic biology, the size of the opening in B.C.’s jar is much smaller.
Comics I Don't Understand 
I didn’t know spiders *could* scream
@Gargoyle: the formerly fat broad can certainly scream.
@Nathan deGargoyle,
That sould have had a beverage warning. I now have coffee all over my screen.
I don’t envy either one of them in this scenario
>> “I didn’t know spiders *could* scream
Spiders got lungs.
@Pete: “Spiders got lungs.” Yes, some of them do have (book) lungs. https://en.wikipedia.org/wiki/Book_lung
Others don’t.
Toilet and outhouse jokes are one thing, but an open latrine hole without even a tree for cover seems more revolting than warranted by this joke. Besides, that “lid” is much larger than any trapdoor spider could possibly build. Even allowing for comic biology, the size of the opening in B.C.’s jar is much smaller.