6. Allison Reynolds (Ally Sheedy) in 'The Breakfast Club' (1985)

"Basket case" Allison is a pathological liar with zero social skills whose oversize parka is a handy security blanket. Why does she end up in detention? "I didn't have anything else to do," she admits. One hairband and lipstick application later (and, OK, several hours of library confessions), she's got a jock for a boyfriend.