Happy Birthday to Me (1981)

Virginia Wainwright is a spirited young woman who has returned to a private school having survived a deadly accident and regenerative brain surgery. She is proud that she belongs to the Top Ten - the school's inner circle with the best students - and attempts to resume a normal life. But her friends are falling prey to a grueling series of murders, and soon there will be no one left to attend her 18th birthday party. Could it be her? Striving to rekindle the memory of her nightmarish accident, Virginia suffers from memory loss and traumatic blackouts. We soon learn the horrible truth behind her accident and what is going on before her birthday party...—Joseph Henson