Since I'd like to add something to this lovely thread, and since "Will I Be Able To Handle Harry Potter and the Forbin Project Because of (enter thing person is afraid of here)" posts pop up so often, and since I rode it recently enough for it to be fresh in my memory, I give you a public service announcement:
Auntie Tricia's Handy-Dandy Islands of Adventure Harry Potter and the Gooey Kablooey Disclaimer Warning Sign Translation Guide!
What Universal's Official Warning Signs Say: Vague warning, something about claustrophobia.
What They Really Mean: This ride was made for people who are fond of being locked in a very snug box (and mind you, I am thin) which is arranged in such a way that the ride feels like a solo excursion even though your friends are six inches to the right and left of you.
What Universal's Official Warning Signs Say: Guests who suffer motion sickness maybe shouldn't ride, or something.
What They Really Mean: Guests who may freak the eff out when their flying box starts falling backwards should be at least aware that this is going to happen. It's cool though; you never actually go upside-down, right?
What Universal's Official Warning Signs Say: This ride involves smoke and lighting effects.
What They Really Mean: Hey, do you enjoy monsters and dragons and giant spiders and more giant spiders and oh God, giant spiders everywhere and giant spiders for nigh on twenty damn minutes it feels like and antisocial trees and demons who eat your sanity popping up like a couple of feet away from your face?
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Well, of course you do! Who wouldn't?
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Okay, my tone may be silly, but these "translations" are serious. This is a pretty intense ride. I should note that IOA offers what they call a "Walking Tour" designed for children too little to ride that takes you through an alternate route through what is, IMO, the best part of WWOHP: the queue through the different rooms of Hogwarts castle. You're not rushed through and you get to fully enjoy the amazing set decoration, special effects, and full "shows" in each room.