Next time you hear that your local supermarket is having a snap sale - think twice! These folks found themselves shopping for eggs one minute, then they are trapped by an enormous tsunami wave where the aisles have swapped their wayward trolleys for an hungry great white shark. Fortunately, one of their number stuck atop the shelves is "Josh" (Xavier Samuel) who used to be a lifeguard. Now he works in the shop too, so has even more extra specialist knowledge. Not so luckily, he has baggage and his ex-girlfriend, her new boyfriend and some some other unsavoury types who all need preserving from...