Yeah, I would be so traumatised by seeing that.
And, I agree that it is a bit irresponsible to prank total strangers, because they could have a heart condition or a psychological disorder, and you could do some serious harm.
I think the lady in the zombie prank video at the end passed out. Whether that will have any long term affect on her health I don't know, but it is something to be considered really.
This is another reason I love the Japanese pranks. They are less terrifying, more silly and humiliating.
Example: