The other technique is to swim fast and close parallel to the surface, and then turn sharply to pop out of the water. Though breaches certainly look spectacular, they may serve a purpose, too. One theory suggests that breaching could be done as a form of social communication. It could be used to assert dominance, to court a potential mate, or simply to alert another whale to your presence. Another suggests it's a good way to slough off parasites from the skin. Yet another even posits that it's simply a good way to get a peek at what's going on above the water. Whatever the reason, the breaches are certainly spectacular.