It was in 1968 - and the pilot was an A1 QFI
on a refresher course. He didn't do his after landing checks properly, so left both engines running at idle instead of shutting one down and putting the other to fast idle (to keep the ac power on-line). As the main hydraulic pressure gauge was ac-powered, this meant no hyd indication (!!) and - surprise surprise - he had a services hydraulic failure = no brakes = leave taxyway and attack hangar!
The instructor sitting in the office at the time was a bit startled, and only just got out of the way in time. After the impact, the pilot climbed out and ranalong the roof of the offices on the front of the hangar, leaving the ac with both engines running at full tilt (throttles rammed forward by collision) sucking in masonry and spitting gravel all over the pan.