Last I checked, only 3 crossovers for Percy Jackson and the Pirates of the Carribbean? I just had to add my own.
Somewhere Over the Sea
Captain Jack Sparrow was, once again, busy arguing with Hector Barbarossa over which of them was the captain of the Black Pearl, when Mr. Gibbs called. "Man Overboard!" That stopped the argument enough for both of them to command the use ropes and hooks to haul the body onto the deck. The one they lifted was a young man, who didn't look more than twenty despite a white cloak in his hair. He was wearing an orange shirt and blue trousers with the sort of fiber sometimes used in the sails. Denim, Jack thought it was called. The boy had a necklace with odd looking pearls, and a strange tattoo.
Gibbs bent closer. "He's breathing." he said. "Weird, though. No ships around here… and what on the Seven Seas is Camp Half-Blood? And he's not even wet!"
The boy blinked and opened his eyes. First thing he noticed was the movement. Then the black sails. He sat up and took a look around him. So, he was on a ship with three masts. And black sails? Funny. Last thing he remembered was going to bed in Cabin Three in the Camp. There were quite a few people looking at him.
One of them moved to him, offering a hand. "I am Captain Jack Sparrow," he said.
"Percy Jackson" Percy said, taking the hand and standing up.
Hector Barbossa cut in, arguing the captaincy and began asking questions. The rest of the crew joined in, overwhelming Percy who was already confused, and his ADHD didn't make the matters any better. "DAD" he practically screamed. "POSEIDON!"
And just as the name of the sea-god left his lips did Poseidon rise up and step onto the ship. The pirates were stunned to silence. One by one they knelt on the deck.
"Hello, Dad" Percy said.
"How are you feeling, son?" Poseidon asked. "No memory losses, is there?"
"Well, no, but. Where…"
"Come now, Percy, you do know where we are, don't you?" the Sea Lord scolded gently.
Percy immediately replied with a series of two-digit numbers.
"Right." Poseidon told Percy. "Now, come along, and I'll explain the matters in a bit more private setting."
"Numbers in response to where?" one of the crew wondered aloud.
"Coordinates" Jack explained shortly.
As curious as the pirates were, no one dared to eavesdrop on what the Sea Lord was talking about with Percy Jackson. They waited, without even daring to move.
Jack looked at Barbossa. "Ship can't have two captains. What say you, the Sea Lord chooses?"
Barbossa shivered. "Aye, the Sea Lord chooses," he agreed. "So long as you ask him."