Never had a big moment with the OT because I got an interest for it gradually, watching ESB for the first time at 1988, then watching the other movies, then the 1995 set, and then the SEs, which by that time I thought that it would NOT replace the OOTs and would be a one-time only presentation (so I was kinda excited to see it).

So the greatest moment was being on the line at the theater for The Phantom Menace, about 5 minutes before getting in. I could feel my heart beat. Some minutes later, it began to go downhill...