It's an interesting subject. I believe first lines are very important. They're like fishhooks. If they aren't sharp and baited you might not catch a fish. So here's a sampling of some of my favorites from books sitting on my shelves:
"She ran, tree limbs and brambles scratching, grabbing, tripping, and slapping her as if they were bony hands, reaching for her out of the darkness."
--The Oath by Frank Peretti
"Valkerie woke up screaming."
--Oxygen by Randy Ingermanson & John B. Olson
"The pickup had been tailing me for at least the last thirty miles."
--On the Run by Lorena McCourtney
"Josee found the canister while seeking firewood in the thicket."
--Dark to Mortal Eyes by Eric Wilson
"Someone said to me that day, 'It's hotter than the eyes of hell out here.'"
--When the Day of Evil Comes by Melanie Wells
"The dead man's mother lives on Castlewood Street, in a battered gray house guarded by a mean echo of 'No Trespassing' signs."
--The Stones Cry Out by Sibella Giorello
And here's a recent favorite from a book that won't be published until October:
"Even in high school I didn't mind sleeping on the ground."
--Forsaken by James David Jordan
Your turn! Post your favorite lines, and maybe why you like them, in the comments. I'd love to hear your thoughts.