Group Hug at Hanging Rock

Sometimes young girls like to lay on each other before mysteriously disappearing Picnic at Hanging Rock is a 1975 Australian mystery film produced by Hal and Jim McElroy, directed by Peter Weir, and starring Rachel Roberts, Dominic Guard, Helen Morse, Vivean Gray and Jacki Weaver. It was adapted by Cliff Green from the 1967 novel of the same name by Joan Lindsay.

The plot involves the disappearance of several schoolgirls and their teacher during a picnic at Hanging Rock, Victoria on Valentine's Day in 1900, and the subsequent effect on the local community. Picnic at Hanging Rock was a commercial and critical success, and helped draw international attention to the then-emerging Australian New Wave of cinema. -wikipedia