Originally posted by: The Heretic Azazel
I don't think Itachi can just show people ANYTHING he wants to, just put them in a fucked up situation that their minds can't handle.
Are you serious?

If it's an innate fear of death that the Mangekyou brings out, why did Sasuke see his parents and family's murder? Sasuke never considered suicide, and how can dead relatives kill you? That was simply a psychological trauma and shock. Nothing to do with fearing death.

I cannot recall the Manga Chapter. However, I'm quite sure it's Episode 82 in the animated series. Watch it. Please.

In the meantime, while Kakashi is crucified, Itachi clearly states (something along these lines), "In this world of Tsukiyomi, I control everything. Time, space and the events are all up to me."

Everything in that realm of those caught within Tsukiyomi are victim to anything Itachi could conjure up, which is why it's possible for Itachi to show Orochimaru losing all of his jutsu. It is also stated that while it is simply an illusion, the pain is indeed extremely real as it's continual stress being placed onto the brain. Kakashi is unable to take the pain any longer, breaks down and falls into unconsciousness.

Orochimaru may be strong, but being repeatedly stabbed, regardless of who you are, is a tough feat to cope with. Especially considering the pain is anything negligible.