Slug
Explanation
The Joke
A boy is shown pouring salt on a slug, with someone (likely his mother) telling him: "Billy! Don't pour salt on that slug! It'll melt!" The slug then speaks up, explaining: "Actually, scientists aren't even sure that I feel pain. What I feel may just be a metallic-chemical response -- the neurological equivalent of flinching to avoid damage, not actual pain." The mother responds: "But you can talk! That means you can think!" The slug replies: "Thinking just makes me want the salt more."
The joke starts as a simple setup about the cruelty of pouring salt on slugs, then takes a philosophical turn. The slug essentially argues that its apparent suffering may not constitute genuine pain in any meaningful sense -- a nod to philosophical debates about qualia and consciousness. But the darkest twist comes at the end: when the mother points out that the slug's ability to reason should make it want to survive, the slug reveals it is instead existentially depressed and actively welcomes its own destruction.
The Humor
The humor operates through escalating philosophical absurdity. What begins as a mundane childhood cruelty scenario (kids pouring salt on slugs) pivots into a discussion of the philosophy of mind and consciousness, and then lands on an unexpectedly dark punchline about existential despair. The slug is simultaneously the most intellectually sophisticated character in the strip and the most miserable -- its capacity for thought has not enriched its life but rather made it suicidal. It is a compact little joke about whether consciousness is actually a gift or a curse.