The Tykes captain felt he should have had a penalty after being caught by Sami Hypia but picked himself up to collect the ball on the edge of the area before firing into the bottom corner to clinch a famous victory.
Lafferty jinked by three players on the edge of the box and played a one-two with Brunt before firing a crisp low shot into the bottom corner from 20 yards.
That tolerance changed when the bottom fell out of the aerospace industry, and the company gave the job of firing Mack to a 25-year-old wise-cracking law student named Michael Konz and a well-liked 52-year-old manager named Jim English.
It was only a temporary reprieve, though, as Obinna added the second after 56 minutes, receiving Piquionne's pass in the area before firing a thumping left-foot shot across Al-Habsi and into the bottom corner.