METAL GEAR SOLID 3: Snake Eater - Master Collection Version

***MISSABLE****
This is directly from the Master Book in the game, hence why I haven't personally unlocked it yet.

There are 7 secret First Person View events (FPV) in the game that you need to press RB for:

1) Krasnogorje: After the event where Snake is looking down through his binoculars from the mountaintop at Volgin torturing Granin, when The Boss rides away on her white horse, press RB to see The Sorrow next to her.

2) Krasnogorje: After the event where Snake is looking down through his binoculars from the mountaintop at Volgin torturing Granin, when Ocelot strikes his trademark pose at EVA, press RB to see EVA do it back at him.

3) Groznyj Grad: During the torture event, when Ocelot walks out of the room, press RB to see The Boss do his pose at him.

4) Groznyj Grad: When Snake and EVA look at one another after attacking Volgin at the rail bridge, press RB to see The Sorrow behind EVA.

5) Rokovoj Bereg: After the battle with The Boss, press RB when her white horse neighs to see the spirits of The Boss and The Sorrow.

6) During the ending, when snake and the president are shaking hands, press RB while the president is standing in front of the windows to see Ocelot outside the window, striking his pose.

7) During the ending, when Snake salutes the grave, press RB to look at the grave through his teary eye.

As I said, these are directly from the Master Book option on the main menu, so there shouldn't be any issues with them.