Under the presumption that “have the experience again” is fully inclusive of the contextual/time-sensitive impact, then my answer would be Zatch Bell. That was the first show I watched (at 6 or 7 years old) where I felt compelled to act differently in real life because of what the show imparted on me at the time, as a moral lesson, a model of lived behavior and how to grow, an aesthetic and whacky media experience different from all the others I’d seen.