Haunted Mansion. To make it short, I was scared of it as a kid, and when I did go on it, I got no sleep the night before, and it made the whole thing worse. I mean I do love the effects, I just don't like everything else. If I ride a ride with "999," then it's Buzz. Haha
Also, Pooh. I used to love it, but I also rode that with no sleep and it made it EVEN WORSE. ESPECIALLY THE BLACKLIT ROOM.
Come to think of it, I'd pretty much put every ride I went on during that first day on this list. Except for the Tomorrowland rides (I did those when I was feeling a bit better, and also ZURG.)