Working at the Tower of Terror for an 8 month college program, I saw quite a few celebs. Especially over summer and Christmas/New Year's.
Michael Jackson actually bumped into me when I was working unload at RnR. He was there for about 2 weeks that summer, and I saw him a few times.
Loaded onto ToT: Steven Tyler, Lance and Joey from NSYNC, Christina Aguilera, Angela Bassett, Miss America finalists (if they count), the 98 Degrees guys, Jessica Simpson, some kid from Boy Meets World
Unloaded: Hulk Hogan, Tim Allen, Mariah Carey
Backdoored (this was the best because there was time to talk to them): Gary Sinese, JC and Joey from NSYNC, Otown, Drew Carey, a bunch of ABC Soap stars, Steven Speilberg's kids (he didn't want to ride so we waited in the control room to watch how it worked)
Other sightings around WDW and backstage: Whitney Houston and Bobby Brown, Sisqo, Rosie O'Donnell, Regis and Kelly, (I worked at SuperSoap weekend, so I met a bunch of soap stars, though I didn't really know who they were), Wayne Brady, Julie Andrews, Robbie Benson, BB Mak
(FYI- there's a book at ToT about 3 inches thick of pics of celebs on the ride - pretty cool, but for CM eyes only
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Celeb sightings around Orlando: Joey from NSYNC at a party, at a bar, at a club, and at another bar. JC and Joey (NSYNC) at a bar and the Alehouse. JC and Chris (NSYNC) at House of Blues. Those NYSNC boys sure get around. Otown at NYPD Pizza. Britney Spears and Justin Timberlake in Starbucks, gy, LFO
Sorry, the list is kind of long...but that was such a great experience for me...especially Steven Speilberg...he's my idol.