1) Zombies don't order food. 2) They definitely don't use cell phones 3) The only thing punching a zombie accomplishes is increasing the risk of being bitten and infected.
Hahahahahahahahah! I know that it shouldn't be funny for a man to be assaulted on false pretenses... But to enter a restaurant, call a man a zombie, then clock him in the face...That's pretty friggin' hilarious.
I wonder if they'll let the guy off the hook if he can convince the judge he really thought the guy was a zombie. In Canada, it can count as self-defense if you're not in danger, but you honestly believe you're in danger.
In the US, the criteria is typically (it varies by state) if a reasonable person would have fear of life or limb.