If you got "big lulz" from that, you're pretty easily amused. No one even reacted that strongly; both videos were pretty much dumb.
As for me, I couldn't resist glancing at the YTMND spoilers a few days ago, but I think it's actually good that I know before hand how everything concludes, because it allows me to go through the book casually, enjoying the ride and calmly seeing how everything plays out to wind up the way I already know it does, rather than rushing frantically to the end just to see omg did he live did he live??