First flight after receiving my HGU 56/P from Gentex (use to fly with some tiny plastic covering with leather ear cups). Refuelled at a small operator in the Lower Mainland, BC. Prior to startup I strapped in and then wanted to check the clearances one more time, so as per habit I stuck my helmeted head out the window.
It wouldn't come back in.
While the flight engineer scrambled to get his camcorder, I unclipped the chin strap, dropped the helmet to the dirt, unbuckled, exited the aircraft and was applauded by a small crowd of onlookers.