How can I pick a random variable, and then pick a random variable from the variable's list?

I have two buttons. One for a random movie flavor, ex. ['love', 'war', 'true']. I have this working. The problem, the second button is supposed to pick a random movie from the movie flavor that was picked. Ex. If "Love" is picked, the a new random would come from the Love List ['Noel', 'Titanic', 'Pearl Harbor']. Appreciate any help, thank you all ... ^ _ ^ ...