Had the right door of a 355 pop when I was in the left seat of the aircraft. No duals were fitted and the P1 couldn't close it. He slowed the aircraft and I got into the back and tried to close it. He was low time with only 15 hours on the 355 and he let the nose drop and the speed rapidly increase as I was about to latch the thing. The airflow seemed to curl round the door wrenching it open, buggering up my collar bone and all the muscle and tendons in that area. Up until then I believed the airflow would hold the thing just ajar, but at 70kt it goes full open at very high speed.
Hurt like hell and as usual was a case of an old 355 with mighty abused doors.