3. P.J. Soles in Halloween (1978)
Seventies scream queen extraordinaire P.J. Soles is never lovelier than when her character Lynda dons a pair of pigtails and taunts us (and inadvertently Micheal Myers) with a short yet very memorable glimpse of her perky chesticles, asking, "See anything you like?"
Unfortunately for her, Micheal does see something he likes and strangles her after the brief boob flash, presumably because he wants the moment to last forever.