Neo: I thought it wasn't real.
Morpheus: Your mind makes it real.
Neo: So what happens if you're killed in the Matrix?
Morpheus: The body cannot live without the mind.

If you die in your sleep while playing his game, you die. If you die in his game itself, you die. If you eat a turkey leg in the game, you get full in real life.

"It was only an illusion, but the more you believed in it... the more real it became."

Tores: But none of this is real!

The Clown: Of course it's real, it's as real as a nightmare.

Kim: The two we found dead, both suffered from massive heart attacks.

The Clown: Heart attack? Now what might cause a heart attack? Hmm... unmanageable stress, perhaps? Unmanageable FEAR? Fear of losing a head, perhaps?