What evidence of ghosts would conclusively prove their existence?

Sound recordings - EVP's exist, Photographs exist, Plenty of personal experiences, many by professional people - Military men, Police officers giving testimony with their jobs at risk, Film, CCTV images, Facts later proven to be true by historical account. All of the above exist, yet are not seen as valid... show more Sound recordings - EVP's exist,
Photographs exist,
Plenty of personal experiences, many by professional people - Military men, Police officers giving testimony with their jobs at risk,
Film,
CCTV images,
Facts later proven to be true by historical account.

All of the above exist, yet are not seen as valid proof.

Please bear in mind most paranormal researchers in the field conduct experiments all the time - with conclusive results sometimes - yet this is not valid either.

- So what would be valid proof?

A press conference?
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