10. It's Scary
No really, it's extremely scary. Halloween Horror Nights is not for the faint hearted and it's certainly not for younger children who will have spent their days marvelling at the parks in the daylight. It's an altogether more adult, more profoundly frightening experience. Basically, if you aren't a fan of people jumping out at you and can't stand awful smells and fake blood, you might want to reconsider whether this is the right event for you. As for the kids, Universal recommends that children under 13 years of age not attend at all, which is some indication of what you can expect. There are no treats at this event, only tricks.