Our Levantines are very fond of fireworks especially in parties and celebrations. Also in our Castilian and Leonese villages rockets used to be fired at weddings and other parties. Not now, there are a lot of fires. But the expression also has a figurative sense that alludes to the cause for which rockets are thrown: celebrate something, rejoice, be happy for something that is right or worthwhile or simply recognize that something is good. Although it almost always has a negative form: Not being or being something to shoot rockets means that it is not as good as presumed or as they say.