Easy:
1. Kid gets bored silly in class.
2. Kid tries to find something interesting while the teacher repeats the same stuff eight times for the benefit of the dumbest kid in the class.
3. Teacher notices that kid isn't listening, screams "ADHD!"
4. Kid gets drugged into submission with Ritalin.
5. Kid drops out the moment he is legally able to.
Been there, done it all except the Ritalin (wasn't yet invented back then).
6. Kid stops taking Ritalin at 18, wakes up from stupor as an emotionally-stunted adult, grabs gun and kills first kid who disses him because he never learned to handle setback as an adolescent.
-PJ