There is over 150 years of research into survival of physical death and communication with people who it is claimed have passed that boundary. Some of it by the finest minds of their day eg Sir Oliver Lodge, Sir William Crookes. There is a great deal of documented testimony for famous mediums such as Alec Harris and Leslie Flint. Anyone curious about this subject would find such works of great interest. I have spent the last five years considering some of the best recorded testimony and it is very persuasive. Having said that, despite all of this I have not (at least as yet) been able to witness the phenomena reported upon by some of these eminent scientists. I think to be convinced of this, one needs to have a direct, unequivocal personal experience. Especially these days it is so easy to fake evidence through video, I would find it difficult to be able to have much confidence in a you-tube clip unless I could be entirely sure of its provenance and of the characters of all the people involved in its production.
Oldseeker knows what he saw. Who am I to deny it? I may ask questions to determine more detail but at the end of the day I would be basing my belief on the word of someone I do not know and about whose powers of observation and rationality I know nothing (no offence intended). The word is prefer to use is "knowledge" rather than "belief" in this context. Those who have observed phenomena in circumstances under which no fraud or misunderstanding is possible, or is a least highly unlikely "know" the truth of what they are saying. Those who have not, including myself, cannot "know" this. The most I can do is remain open-minded until such personal evidence comes my way (or not as the case may be).
As a final observation, I defy anyone who has read some of the major investigations carried out over the last century or so do dismiss such phenomena out of hand.