In my last game I had a scientist who for some reason would wander off on his own to pick berries. He wouldn't do any harvesting or fishing, just foraging. The farmers would ignore the berry bush and either go fishing or water the crops while the field lay fallow.

When I spotted him I would drag him away since the berries were only worth a couple of food points. It seemed more sensible to at least wait until the number of berries made it worthwhile to pick them. However, a glance at the log file showed that he would still go foraging while my back was turned and the game shut off.