There's something about a beautiful premise, though--it can be a work of art in itself. And an opening line that contains the promise of that premise...well, now, I bet those writers have happy moms.
As Ron's pick-up-line analogy implies, it's a fine line between intriguing and slutty. Here's a couple openers I like (with apologies for the wonky formatting, but I've spent a half hour trying to make it look right and Blogger just won't let me, clearly as punishment for not listening to my mother):
I am in love with Mr. Lindstrom, my science teacher. I found out where he lives and every night I perch on a tree outside his bedroom window and watch him sleep. He sleeps in his underwear: Fruit of the Loom, size 34.
-Owl in Love, Patrice Kindl
First thing I did was, I stole a body. I could have made my own, but I wasn't in an artistic frame of mind.
-Repossessed, A.M. Jenkins
The first thing you find out when yer dog learns to talk is that dogs don't got nothing much to say. About anything.
"Need a poo, Todd."
"Shut up, Manchee."
"Poo. Poo. Todd."
-The Knife of Never Letting Go, Patrick Ness