Not long after purchasing the car new I was starting out from a stop and started to push in the clutch to shift to 2nd gear when there was a momentary jolt and everything in the cabin was thrown forward. The car acted as if the entire drivetrain had locked up. The problem was immediately reported to the dealer but it was one of those 'can't fix what we can't find'. The issue may occur one or two times a month. My concern is eventually its going to do this and something will break due to the repeated stresses.

Update from Feb 1, 2013: The problems was apparently resolved when the computer was updated at the 60,000 service. I say apparently because a broken hydraulic engine mount was also discovered and repaired however since the car has had the problem since it was new I believe it was a computer related issue.