Usually you have to shake a beer to build up the pressure, but not Down Under.
An Australian brewer has had to recall some of their beer, due to potential explosion. Maybe that should be expected from a company called Ballistic Beer!
The Ballistic Beer Company was forced to recall their Twang Brambleberry Sour cans and kegs immediately because the beer in the cans could be affected by refermentation leading to explosion. The kegs aren't at risk of exploding, but their quality could be affected by the refermentation.