Well, I got both of my parents to read it and my sister. Then they convinced their friends/siblings.
But my biggest accomplishment was getting my 58-year-old (MALE!!) teacher to buy Twilight at out "Book Fair." He thought I was insane and only bought it to shut me up...but he was hooked after the first page.
I jokingly told him I'd get him the next two books for Christmas; he was a little miffed I wasn't serious.