Goo.
Sometimes, I think about everything living on Earth and how every single thing is just, basically...goo. We're all made of goo. Living tissue=goo. We're just so squishy and gooey. And whereas thinking about how we're all made of atoms makes me think of physics and wonder and Carl Sagan, thinking about how we're made of goo always ends up with me poking my own arm and muttering, "Goo."