I remember realizing that everybody swallows.
I was probably three or four. Saliva would gather in my mouth when I wasn't even eating, and I'd have to swallow it. Sometimes I worried about this, and wondered if I was defective in some way. One day I finally got up the guts to ask my mom about it, and she laughed at me and said that everybody swallows, it happens all day long to everybody.
And I had thought I was special.