Jellyfish

When I was a kid, I was stung by a jellyfish - jellyfish size of a dinner plate. Back then, I didn't know how harmful its arms/tentacles were. Well, it simply left a long curve-like mark in my left hand.

Most jellyfish have tentacles or oral arms coated with thousands of microscopic nematocysts; generally, each of these nematocyst has a "trigger" (cnidocil) paired with a capsule containing a coiled stinging filament, as well as barbs on the exterior. Upon contact, the filament will swiftly unwind, launch into the target, and inject toxins. It can then pull the victim into its mouth, if appropriate.

Eew. I never thought I'd experience that. But you know, the scar that it left brings back memories in my childhood. It brings back the memory that the adults had to use human pee + calamnsi + beer + wine + everything else we got, to immediately treat the jellyfish sting in my left hand.