She begins to dance wildly and erratically, ultimately causing her weak heart to give out. Cliff, drunk and driving erratically, crashes the car in the woods. Outside, he finds Martha, who behaves erratically. Lucas starts having hallucinations that lead him to behave erratically. Even then, at high engine revolutions Austrian synchronizer gears tended to behave very erratically. Dutton rolled his car while in pursuit of an escaped prisoner who was driving erratically. He began to behave erratically in public, which embarrassed his friends. They tended to run too deep, explode prematurely, run erratically, or fail to detonate. Pitchers also throw knuckle balls which are generally slower and move erratically. Davis's changing emotional state causes him to behave erratically. The person kept coming toward me, moving very erratically. You see a pot-bellied scarecrow flapping erratically. The aircraft was low on fuel and allegedly flying erratically. There were operational problems with missiles that responded erratically and sabotage was suspected. It involved groups of people dancing erratically, sometimes thousands at a time.