It doesn't take two smart people to produce a smart child.

My children go to a school for gifted and talented children, and about once a month I'm reminded that it doesn't take two smart people to produce a smart child.

Parents usually enter the long and narrow parking lot in front of the school and drive all the way up and pull to the right to drop off their child. The cars leaving pull to the left side of the parking lot and drive out. It all flows very smoothly and safely. Every once in a while, though, a parent enters the parking lot and just stops in the middle to drop off their child, obstructing the cars trying to leave the lot and forcing the cars trying to enter the lot into a long line out into the busy street.

THAT parent is obviously not the smart one ;-)