You know at the end of Monsters Inc.
when Boo opens her door, expecting to see Sully and give him a big hug. She is smiling and expecting to see his familiar, loving face — but is instead faced with a stark, empty closet. She calls out to him, but only hears her own echo. Remember how your heart sank when you saw that part?
Yeah, that. That’s how I feel right now.
