Did you know … ? 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, the average sandwich here in Australia is affordable and a lunchtime favourite. Celebrate world 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.