Orange Eyes
Parents lying to keep their kids from lying is a hilarious irony that we can’t seem to get over. So, this OP’s mother apparently told her that every time she lied, her eyes would turn orange. So, naturally, whenever she did lie, she would cover her eyes so that her mother couldn’t see them turning orange.
Of course, her mom would figure out exactly when the OP was lying because she wouldn’t let her see her eyes. Children are so gullible sometimes and parents really do take full advantage of it, huh? We wonder how old she was when she figured out the truth.