Not long ago an S76 was being parked by the PF in the left hand seat, the PNF in the right seat was eyes inside reading the checklist, the PF reached over to set the parking brake, as he did he thinks 'he may have leaned on the right pedal' as he was pushing the toe brake. The aircraft pitched nose up and rolled towards the left side. By the time the two pilots noticed the blade was a foot or so away from hitting the concrete on the left. 12 very scared passengers, one damaged left wheel, a change to the ops spec and clean trolleys all around.