Thinking about when I was in preschool. We had to make Valentine's cards. Valentine's cards, of course, are pink. However, pink is a girl's color. So I had to learn the difference between "girl pink" and "boy pink".
If I ever got them confused, I, at the young age of three, would be viciously mocked by the other kids and the teacher. Can you tell which pink is the boy pink and which is the girl pink?