I just had a scary dream I think would be a good horror movie idea (at least for today's standards)

There's this huge indoor replica of New York built. It's at 1/10 scale of Manhattan, but it's traveled by waterways instead of streets. It has small boats that hold about 10 people who can travel around anywhere they want within the replica. The sky is painted on the ceiling and there are buildings either painted on the wall or simulated by props on the walls. It is all lit by lights pointed up at the ceilings.

There are 5 kids who all work together at the replica site, doing maintenance and helping guests and things like that. One of the girls, Sarah tells her friends it's her "Crazy Day," a day to be celebrated! She says they should go on the ride after it closes that night to celebrate it with her. During the end of their shift, one of the kids (me in the dream so I'll call him "Tyler") finds some SC cards labeled in very strange writing saying weird shit like "eat me" and "lol@this." He finds 5 in all.

Because they look so weird and he finds them in a very odd location, he makes up a story that they were created by the ghost of a young girl that had drowned on the ride a year or so before. He makes a big deal about the cards and says they probably have audio tracks where the little girl warns then about something big that's going to happen.

He's telling this story as they are entering the replica, which by now is very dark and creepy. There are only minimal lights and it makes shadows look like they are moving around the buildings and up near the ceilings.

Sarah begins to act very annoyed that he is stealing the spotlight on her special "Crazy Day" and throws the SD cards into the water. Tyler jumps in after them, diving toward the bottom of the 5 foot channel. Sarah jumps in after him and a couple others get knocked in in the commotion.

One of the boys, Jeremy, tries to hold Sarah back from attacking Tyler as he's going for the cards. She punches him in the face and breaks his nose on impact. As another boy tries to grab her from behind, Tyler sees her literally tear his arm out of the socket, sending blood everywhere in the water around him. Everyone panics and they start to swim away from Sarah as fast as they can to find some kind of cover to hide from her. The entrance to the ride is now locked behind them and they have nowhere to run or hide, except in the water. Sarah has the boat and is coming after them.

As a side note, it really freaked me out seeing my friend getting his arm torn off and that's when I woke up!