Quote from Dorothy in Long Day's Journey into Marinara
Dorothy: Ma thinks that Angela tried to steal her boyfriend. Blanche: And you don't? Dorothy: Of course not. Blanche: Don't be so sure, Dorothy. Angela and Sophia are sisters. Sisters have a natural adversarial relationship. Rose: That's 'cause it's genetic. It has to do with the double helix of the DNA molecule. Dorothy: What? Rose: It's true. I saw it on television. Peter Marshall played this microbiologist on The Love Boat and he was conducting sinister experiments on the Landers sisters. Dorothy: My apologies, Rose. For a moment there, I didn't think it had been documented.