AFTER PUSHBACK WITH ENGS RUNNING AT LFPG; B767 CAPT NOTES ACFT MOVEMENT AFTER SETTING PARKING BRAKE.

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THIS WAS A ROUTINE PUSHBACK FROM A HARDSTAND AT LFPG. AT THE CONCLUSION OF THE PUSHBACK; I WAS ROUTINELY TOLD TO SET BRAKES; AND DID SO. WHILE THE GND CREW WAS DISCONNECTING; THE FO REQUESTED A FREQ CHANGE TO GO TO GND CTL. I TOOK A MOMENT TO GLANCE AT THE ARPT DIAGRAM ON THE SIDE WINDOW CLIPBOARD. AS I DID; I DISCERNED THAT THE ACFT WAS MOVING. I STOPPED THE PLANE AND CALLED TO THE GND CREW TO DETERMINE IF ANYTHING UNTOWARD HAD OCCURRED. THE GND CREW TOLD ME THAT NO DAMAGE HAD OCCURRED; AND THAT ALL PERSONNEL WERE OK; BUT THAT THE PLANE HAD MOVED FORWARD WITH THE TOW BAR STILL ATTACHED. SHE WAS DESERVEDLY ANGRY; AND I WAS QUITE HUMILIATED. IT WAS FORTUNATE THAT THE PLANE MOVED ONLY INCHES; AND THAT BOTH THE PUSHBACK TUG; AND THE PERSON DISCONNECTING THE TOW BAR WERE CLR. 1 OF 3 QUITE UNLIKELY THINGS HAD OCCURRED: 1) EITHER I FAILED TO PROPERLY SET THE BRAKE; 2) IT DISCONNECTED ON ITS OWN; OR 3) FOR NO REASON AT ALL I RELEASED IT. THOUGH ALL QUITE IMPROBABLE; ONE OF THESE MUST HAVE OCCURRED. THE TRUTH IS THAT I AM CERTAIN I SET THE PARKING BRAKE; AND HAD NO REASON AT ALL TO HAVE RELEASED IT PREMATURELY. THERE WAS NO RUSH; YET THIS DID HAPPEN. I SUBMIT THIS BECAUSE I WOULD HAVE CONSIDERED THIS TO HAVE BEEN A COMPLETELY BENIGN PHASE OF FLT -- PARKED WITH ENGS RUNNING. YET; CLRLY DAMAGE OR INJURY COULD HAVE OCCURRED. AFTER 30 YRS OF THIS; I LEARNED YET AGAIN THAT THERE ARE NO BENIGN PHASES OF FLT; AND THAT YOUR HEAD HAD BETTER BE IN THE GAME AT ALL TIMES; OR YOU'RE NOT REALLY IN THE GAME AT ALL.