Can you imagine buying nothing -- no food, gas, toothpaste, hairspray -- for 24 hours? What about staying home on Nov. 29 -- the biggest shopping day of the year and the start of the holiday season buying frenzy? As part of the fifth annual international Buy Nothing Day (BND), Canada's non-profit Adbusters/Media Foundation is challenging consumers worldwide to stand up on this "holiest of all shopping days" against pressure from corporations and advertisers to buy, buy, buy.