Dopamine dysregulation syndrome in non-Parkison's subjects?
Not quite the features of dopamine dysregulation I was looking for, but plain psychosis (persecutory delusions and auditory hallucinations) was discovered in a case of conversion disorder who imagined had Parkinson's and self-medicated. Of note is history family of schizophrenia, but psychosis subsided 

Also in not quite healthy subjects, there's a 1971 study of L-dopa in depressed patients. Mood elevation was reported in this study (unlike in the one on healthy volunteers) and some sobjects developed hypomania, but practically all who did had mania before (so they were bipolar). But there's not much detail on the hypomanic features developed on L-dopa. The dosage was higher in this old study, mood effects were not noted until dosage exceeded 300mg, which above the one used in the 2012 study on healthy volunteers.