My nomination is for the bloke who took his PC12 to RAF Valley when they were a) in lockdown and b) closed for runway maintenance.
It wasn't just a momentary lapse of concentration or poor judgement on the spur of the moment but something planned when he woke up in the morning.
I'd have thought that by the time you've got sufficient acumen to be able to afford and learn how to fly a complex aircraft, you'd also be imbued with the common sense to operate it properly - clearly not!
TOO