Recently, I was looking at a copy of Celine's Journey to the End of Night, and it had an afterward written by William T. Vollmann.
Vollmann's been on my radar for a while, although I haven't been able to finish any of his books yet. I'm currently chipping away at his 2009 behemoth, Imperial.
Anyways, back to his afterward. It's got a great opening line. It goes like this:
--Reader, fuck you!
I laughed for about 3 minutes after reading that.
And, since I'm writing about first lines, I'll mention another book I've got lying around my apartment, tempting me to just read it already. Wittgenstein's Mistress by David Markson starts off like so:
--IN THE BEGINNING, sometimes I left messages in the street.