Frozen / Tangled Crossover - What if the King and Queen of Arendelle were on their way to Rapunzel's and Eugene's wedding, when their boat sank, and that's why Rapunzel and Eugene felt the need to come to Elsa's coronation ceremony. Like remember it says "three years later ", which is the present? Tangled was made three years ago. MY MIND JUST EXPLODED!!! Awesome! Mind Blown!
Frozen / Tangled Crossover - It would be so interesting knowing Rapunzel's and Eugene's point of view during the story of Frozen. (They witnessed the reveal of Queen Elsa's magical powers, and were stick in Arendelle during the eternal winter that she caused.)