One of the best things about living in a family is that, like bacteria, your own culture tends to grow over time.And then there are other cultural phenomena that families, like true colonials, observe and incorporate into our (naturally hilarious) family humour and clutch tightly at our breast as our own. By their very nature, the appeal of these insider witticisms is highly localized, yet they can also have broader implications outside our front door. In our house, one of the most long-lasting of these is a concept we like to call ''must-orderitis,'' after a story one of us - I forget now who - once came across in the often brilliant Jewish hipster publication called Heeb. ...