I tried Apple Jacks and Orange Juice once when I was 7 because, well, I don't know really, I was 7 and can't remember a lot of why I did things, but I will tell you, the combination was too sweet and too tart at the same time and I never tried it again. Maybe it's okay with some things, like Corn Flakes or Bran Flakes; probably not Frosted Flakes so much. I also tried cereal and tap water and it was a weird texture difference that I couldn't get over.