Evidence for Zombies:
1) I went to Six Flaggs three times last year (once in early June, and twice in late October) and 2/3 of the time I encountered zombie after zombie.
2) Zombies love to eat brains and there are 6 billion human brains out there to eat. People are just too greedy not to not be zombies and cash in on all those brains.
3) There is no good regulatory force to monitor for zombies. Police and military are paid by tax dollars collected by the government, the very people who are trying to cover up the existence of zombies!
4) When I wake up in the morning my bed sheets are covered in urine so a zombie must be peeing on my crotch at night.