No 5-star rating for this Uber driver! He delivered a heavyweight punch to an elderly passenger -- reportedly for one simple reason: not enough legroom. Caught on surveillance camera in Dallas Wednesday ... the Uber driver picks up a couple, but doesn't hit the road right away. A few minutes later, he pops out of the car at the same time as his passenger, 68-year-old Suleman Gauba, and viciously jabs him in the back of the head -- so hard, it sends Gauba crashing to the ground.