Quote from Carla in Li'l Sister Don't Cha
Carla: [after jumping down the stairs] It won't budge. I think I'm going to be pregnant for the rest of my life. Just like it said in the yearbook. Sam: Stubborn little bugger, isn't he? Carla: You know, Sammy, I think he learnt about brothers and sisters and decided to stay inside where it's safe.