Hazel doesn't like most current movies. She didn't really understand all the concepts and modern slang, as Leo called it.
However, she'd once run across Percy and Piper watching High School Musical, and had instantly fallen in love. It reminded her of a musical Sammy had once taken her to see at the theatre in New Orleans.
The three of them had ended up marathoning, at least that's what Piper said, the trilogy that day. And Piper had stated that from then on, they'd do the same thing every Friday in Percy's cabin, and that anyone else could join.
One week later, in the Poseidon cabin, Percy, Hazel, Piper, Leo, Will, along with most of his siblings, and almost the entire Aphrodite cabin were sitting around Percy's TV, popcorn in hand, ready to watch the movies.
That is the day they discovered that Percy makes the worst duet partner ever, and Leo should never, ever be trusted with a microphone.