"What’s that in the mirror, of the corner of your eye?"
-Doctor Who S08E04 “Listen” trailer
"He still visits my sister, once a year, every year. I wonder if one day he might forgive her… but there she is. Can you see? He trapped her inside a mirror. Every mirror. If ever you look at your reflection and see something move behind you just for a second, that’s her. That’s always her."
-Doctor Who S03E09 “The Family of Blood”