Joker's Queen comes from a friend who gave me a Queen of Diamonds playing card in the 5th grade. I had it in my pocket one day, and because I love stories I made one up. Yes, about cards.
The Queen doesn't love the King anymore - she loves the Joker. But she doesn't know if he loves her back. So she picks the petals off of her flowers, asking if he loves her. The petals that fall become her tears, because she is afraid he will never love her back
But she calls herself the Joker's Queen, because she always has hope that in the end, that's what she will be.