Rides the short bus.
Simple. Maybe simply awesome, but they'd have to be awesome enough for the title.
nope, I changed my mind. I like this answer best.
dang, why didn't I think of that, indeed...that one...
uneducated? Dunno sometimes stupid is just too stupid to avoid calling it stupid.
At least we know that he or she would not do something really shady.
More than a single word, these are quotes: 2 sandwiches short of a picnic<br />
Not the sharpest tool in the shed<br />
Not the brightest lightbulb
They have a different way of thinking.
touched? I think I like this answer best.
How about dopey or naive? That's about the most kind I can think of...