A very interesting piece of video! This is deep indeed!

I think crazy applies to those who cross into other dimensions helplessly or in an uncontrolled manner as well as without the capacity to make sense of the experience, because they are only connected to the material experience and its manifestations. Crossing over makes them ungrounded and out of touch with reality so to speak.

Then there are those who can, aided by psychoactive elements either naturally produced or pharmaceutically engeneeried tap into the energy of other dimensions. In those situations there are those that loose footing of reality, therefore the dangers and disclaimers against their usage/applications. 

In that category there are also those who are dedicated psychonauts or explorers of altered states consciousness who try by default to maintain objectivity during the experience in order to get a deeper understanding of existence, as this brave guy did.

The same concepts of spiritual/religious elevation were developed by the rishis, some of whom still partake in substance usage abundantly. And such substances were purposefully used by great yogis of old, as noted in shastric literature.

Of course the highest ones are those who hammer at higher levels of consciousness as part of a systematic practice, in order to develop deeper understanding and more critically familiarity with such states, in anticipation of future environments to partake in once evicted from the material dimension. 

Some key observations include the time passed that was only 4 minutes, so definitely a different dimension. The transparency and humility in his narrative leave me to appreciate some genuine possibility of a real explanation regarding the use of psychoactive materials in ancient Egypt (to include the resemblance of so-said electric transformers in pyramids to pipes …) as speculated upon by others (to be clear). However, he is speaking from personal experience, and that makes a great difference!