actually, the scientific way is to believe that generally, there is no truth that could not be discovered to be untrue after all. theres always tomorrow is only true, until it becomes untrue. and at that point, theres always tomorrow can never be 100% true anymore
further, everything is always just an assumption. nothing can be proven true (even if it is handled like that), its more that things get proven to be "very unlikely not true"
also, when we have an argument, we test if the opposite argument holds truth.
if it does, we assume the original statement to be wrong with this or that amount of certainty.
if it doesnt, we assume the original statement to be true (with this or that amount of certainty)
here: H1: the flashcard is fake
H0: the flashcard is real
do we have any supporting evidence the card is real? no. not in any way, all we get is a very short video, thats recorded sideways, with parts cut off. no view of the display and everything happening very fast. all of this is notably also used in many of these days viral marketing videos
since there is no proof, h0 seems to be untrue, making h1 the favorable assumption.
works the other way around too
H1: the flashcard is real
H0: the flashcard is fake
do we have any supporting evidence the flashcard is fake?
yes. short video, bad quality, no direct screen view, it does everything every other troll video did so far...
yeah. saying that, yes, chances are, this is fake.
but there is this very faint and incredibly unlikely chance, that this is not fake. for example, there could be a scene team, acting like jerks by trolling us, pretending to be someone with no name. and in a few weeks they come out like yeah, we did it, no hard feelings eh?
as a final note, my memory could very well be playing tricks on me. my lectures about the whole testing of hypothesizes were quite a few years in the past already. so i might have jumbled it up completely xD but i assume i've got pretty good chances to have said the right things