When Napoleon conquered Egypt, he visited the Great pyramid and asked to be left alone in the King’s Chamber while his soldiers waited outside. When he emerged from the pyramid, all of the color had drained from his face. He was ashen and looked absolutely shaken. People asked what happened, but he refused to talk about it and ordered that he never be asked again. On his deathbed someone remembered this incident and said to him,
“Do you remember the time you spent in the King’s Chamber and wouldn’t speak of it? What happened?”
Even on his deathbed, Napoleon refused to discuss the matter.
Source: Inside the Great Pyramid