Completely Disagree!
I do infact not have ADHD, I have the lesser, ADD. The problem for me is that I have a hard time focusing on one subject for long periods of time. I have the hardest time in school, and for every hour that a "normal" student studies, I have to study 2.5 hours or more to learn whatever subject it may be. Before anyone says anything, its not be simply being distracted. There is a difference between daydreaming, and add. Being someone with it, I can tell, and feel the difference, but its impossible to describe.
But, In no way does this make me incapable of waiting in line.
ADD, ADHD, no excuse for skipping lines.
EDIT: ^ I do see your point and also agree. I love my classes in school, but that still doesnt change the fact that I will "come to" for a lack of better word, and have no idea what has happened for the last who knows how long of class.
So it really comes down to the severity of it as well as parenting, as well as a whole bunch of things. Even with how severe my ADD is, I can still wait in line. End of story.