Spider in the Toilet with a Shadow

Alright, listen up, numbskull. You see the spider in the toilet? The person *says* they're scared of that. But look closer at the water. See that shadow? It looks like, well, something else entirely. The 'ignore shadow' part? That's the joke, you simpleton. They're telling you to ignore the real reason it's awkward or scary, pretending it's just the spider. It's funny because you *can't* ignore it, and it implies a potentially embarrassing situation or image associated with the toilet. You probably wouldn't get it, you uncultured swine.