Did you know that the most expensive sandwich ever sold was a grilled toasty that seemed to have an image of the Virgin Mary on it? It sold for USD28,000 in 2004. Luckily, here in Australia you don't need a small loan to purchase everyone's favourite lunchtime snack. Celebrate Sandwich Day in your office with an informal get-together at lunch. Order in, or ask each team member to bring in one ingredient and employees can assemble their own favourites.