Horror Show

I'm watching a TV show, several episodes.
Possibly Monk? Some detective show, anyway.
A boy has a pet parrot, tropical red, it sits on his shoulder and talks.
He wants to trade it for an iPhone.
Adrian can't understand this for the life of him.

The next episode begins, and the detective is doing a voice-over
but I'm not just watching anymore, I'm there.
A wide, lazy river where two boats full of teenagers race
Or one group might be on a wooden dock
Overhead, the lines for a cable car. Mountains in the distance.

"I didn't know I would be called upon to solve
the most gruesome mystery of my life.
How were two young people horrifically mangled to death,
several more crushed,
and a whole river set...ablaze?"

But I know how. As he speaks, I see it.
The cable line snaps. It snaps down and slices two girls in the speedboat.
One falls back with a bloody gash on her face, dead.
The other's hands have been neatly amputated.
She holds up the stumps with a demented, sighing laugh of pure hopelessness.
She looks almost but not quite like Kirsten Dunst.

The cable car has landed on the dock, killing most of them.
One of the survivors is frantically pushing a pole through the water,
as if the dock is a raft that will move.
"We can keep going, we have to keep going--" she mutters, insane.

"Go on then," the handless girl says, smiling wearily through her tears.
"I hope you win the damn race."
It takes her a minute without fingers, but she lights a match against the boat
and drops it.
For some reason, she, the dead girl, the boat and everything surrounding it
burst into flames.
She has killed herself and the other survivors.

What is the mystery of the show?
Apparently, the cable car was dropped on purpose--it was murder.

(It took me a long time to get back to sleep)