A man's wife was dying

A man's wife was dying.
He was sitting by her bedside and holding her hand, and then in a tired voice she said, "There's something I must confess before I die." "No, there's nothing to confess," the husband murmured. "Please. I need to tell you . . . I had sex with your best friend and your brother and then your brother's best friend and your father." "I know, honey," the husband said. "That's why I poisoned you. Now just shut your eyes already!"