Military training base in the tropics. Two gentlemen in full flight clobber walked up to the guard at the entrance to gain admittance to said base. The wearing of flight gear off base was an absolute no no. Instructor and partner in crime had taken off in a single engine Beech product and found themselves unable to remain airborne, resulting in forced landing. Frost on wings.
In my 15 months there never saw frost. Lack of familiarity, complacency or........