This quote is taken from Rick and Morty - Season 1 Episode 8
Summer finds out that she was an unwanted pregnancy, and the news upsets her greatly. Seeing her parents achieve their dreams in realities where she was not born, she tells them that she is running away. Summer goes upstairs and begins to pack, and Morty attempts to console her. She attempts to push him away before he points outside to the graves in the backyard (from the episode "Rick Potion No. 9"). He reveals the truth that he is not, in fact, her brother but a brother from another reality. Morty tells Summer "Nobody exists on purpose, nobody belongs anywhere, everybody is going to die....Come watch TV?"