Sarah Jane, at a very young age, upon learning that girls could not marry other girls: "Noooooo! That means I can't marry Marlena."
Some context: When SJ was very young and in the car with her materfamilias, the two were having a conversation about something of no great import when, in the natural course of the conversation, the latter mentioned that girls were not allowed to marry girls and boys were not allowed to marry boys. (This was in the aughts, when gay marriage was verboten.) Suddenly, SJ, with tears in her eyes, cried out as quoted above, referencing her BFF. Her materfamilias had to explain to SJ that when she was older she would have no interest in Marlena as a marriage partner (.....not that there's anything wrong with that).