Metal Gear Solid 3 secrets

Radio Frequency
This can be obtained in a few ways
 * during the torture scene if you press R1 you will see the sorrow holding up a sign containing the frequency
 * if you throw the food back to the guard three times a cutscene will happen. Press R1 and you will see the code on the back of the photograph.

Other Methods

 * In the Cure screen spin snake around and when you return to the game he will puke, the guard will open the door to invesigate and snake can use the opertunity to attack.
 * use the fake death pill, once the guard enters the room use the revival pill (you did retrieve it in the cure screen didn't you :-) )

Humerous Cutscene
If you leave the transmitter in snakes back when you leave the cell. When you recover from the battle with the sorrow there will be an ocelot unit in the forest. This will trigger a hilarious cutscene where Eva takes the transmitter out for you.

Scientist Genocide
On Snakes second return to Grozyni Grad on group of GRU soldiers is firing into one of the buildings by entering the building without engaging them you will findthat there is no-one in the building (apart from the hanger).