on the basis that the briefing was not conducted in the normal fashion
I argue that unusual deliveries of the very important safety briefing command far more attention than the boring and patronising examples. Take note that all the important bits are included as per requirement. Of course, I accept that one can also argue that by the time you hear the amusing version for the 5th time it will have as much impact as the stiff boring by-the-book version. No can win.