The billions that got pumped into vaxine research... The mRNA method has received a nobel prize. Before this we had no good way (or as safe) to pre-train the immune system to "if you see this (virus, etc.) again, raise the alarms". Now we do.
Edit: updated the wording a bit.
100% Nope: A episode from supernatural, where ghouls half way succeed to eat Sam. (I consider it as the most gruesome horror I have ever seen, and I don't think I have the stomach to see it ever again. The blood draining is a ... no.)
Yellow brick road on otherhand hits the weird places spot of SCP, which I can't get enough. (not horror really, but still)