[Things Percy is sure of, but he's not intentionally trying to drown the kid! Just back up.]

You should try skateboarding. Without all the fancy tricks. [Because you know he's obviously got water power but maybe he doesn't have wind? Oh Percy. Percy just likes to do dangerous things and relying on the water takes out the dangerous aspect of surfing.] Yeah, Greek God. Lord of the sea, Earthshaker, Stormbring, Father of horses. And that last one gets really weird at a Macy's Day parade.