...and looking westward she stared straight into the eyes of Glaurung, whose head lay upon the hill-top. Her will strove with him for a while, but he put forth his power, and having learned who she was he constrained her to gaze into his eyes, and he laid a spell of utter darkness and forgetfulness upon her, so that she could remember nothing that had ever befallen her, nor her own name, nor the name of any other thing... J.R.R.Tolkien "Silmarillion"