The most surprising reaction to me was from one cis female friend with whom I've been friends now for 17 years. I told her, unsure of what to expect but she's pretty open minded and she didn't disappoint, accepting me very quickly. She then told me that "Now everything makes sense." I asked her what she meant and she said that I was unlike any man she'd ever met but upon learning that I was trans, suddenly everything feminine about me fell into place.
What was even more surprising was my favorite cousin, upon telling her this, said almost the same thing. I told her we'd not seen each other much since we were teens, though we'd spent tons of time together as children. She said she knew and that was what helped it all fall into place, that I was unlike all the other boys.
All this gave me pause in that I'd thought I'd hidden everything so carefully for years and then I discover that my real self had been leaking through all that time.