well you can NOT be a 100% sure that you will ever die, until the day you die. so that isn't true. That movie it might be so that indeed has an end today, but should it SOMEHOW gain a few more hours on it tomorrow and the day after that and after that and so forth it would have no end- so that isn't true either.
the world: same thing you can NOT be sure, because you do NOT KNOW what will hapen in the FUTURE.
everything indeed has a beginning, but an end, that is questionable.
I admit this is all far fetched an all, but the point still stands, WE CAN NOT PRODICT THE FUTURE. WE CAN ONLY MAKE A CALCULATED GUESS BASED ON EXPERIENCE.
hmmm well complicated that isn't exactly true, as I have been trying to tell anyone here, modern science can NOT look in the future.
Maybe tomorrow someone will discover the end of pi, however unlikely it might happen. same for a ray, like it is now, there is indeed no ending nor beginning-but who knows what tomorrow will bring?