WARNING: If you have not yet seen Pirates of the Caribbean: At World's End, this holds spoilers.
After watching it the first time, I went back and watched Dead Man's Chest again to search for hidden things; and I found several. But the one that shook me up the most was the one hinting the fate of my absolute favorite character, Will Turner. I had already had that feeling that Will was going to die, but then I knew for sure when this happened:
When Tia Dalma first sees Will, she says "You have a touch of destiny about you, William Turner."
As Tia Dalma throws down all of the crab claws, she says "A touch of destiny!" She was referring to the Flying Dutchman as she said that, and it was what she first said to Will. . . which made me think Will was, for sure, going to die on the Dutchman and then somehow become the new Davy Jones.
I searched on the internet, and sure enough. . . I was right.
I feel so wise (and heartbroken). I hope everybody reads this because I will NOT be doing it again.