After seeing the video on the front of Flight International's web site, duty of care and reckless endangerment come to mind. Jail terms and loss of licence are a few other thoughts. Did the Captain seek consent from his passengers? What was the Captain thinking?
Jail might be a tad, extreme, but this flight might be indicative of the attitude of many CX pilots.
Hope not.
Brain out to lunch would be appropriate.
Sacking...yep, as a lesson to others.
Want to demonstrate low fly-by's?
Buy you own aeroplane, not use a public transport aeroplane, that belongs to someone else.
I repeat, he was a silly fool.