First, it must snow.  It must snow a great deal. Then you will need three small children.  Close their school for the day, and find an expanse of snow-covered ground.  Be the first there, because that makes it more fun. Okay, I can't do the instruction thing any longer, because it hurts.  But this works best if you don't have dogs - with dogs, you can never quite scoop up snow with abandon.  However, you can be sure that some of your whites will go yellow.  I recommend, before building an igloo, that you put down the dog.  Igloos are a significant challenge.  Respect the igloo. As with all building projects, appoint a foreman.  For best results select a woman, because it cuts