UUH help! two naked people in my frontyard?!!!?

OMG IM FREAKING OUT MY PARENTS WENT TO HAVE A NIGHT OUT AND THEY LEFT ME IN THE HOUSE ALONE AND I WAS WATCHING A MOVIE ON FOX AND I HEARD SOME REALLY MOANING IN THE FRONTYARD AND I THOUGHT SOMEONE WAS GETTING HURT BUT THESE TWO TEENAGERS ARE HAVING SEXUAL INTERCOURSE IN MY LAWN!LIKE SERIOUSLY THERE MY NEIGHBORS CHILDERN AND THE GIRL IS LIKE HALF NAKED AND SHES MOANING REALLY LOUD WHAT DO I DO IM SCARED!!!HELP