remember...to be believed and convincing, it is not necessary to be right...you just have to have a certain degree of internal consistency, whether or not you have facts & reason on your side.

The philosopher David Hume managed to convince a LOT of people that Solipsism was the way 'reality' worked. Everything just might BE "only in your mind". Hume had a nearly air-tight way of showing his theory was 'correct'....very consistent internally.....after you accepted his (very suspect) premises.