What is the most expensive item at McDonald's?

I'm curious, what is the most expensive item that you can purchase at McDonald's? I've heard rumors of some elaborate and luxurious meals, but I'm not sure if they're just tall tales. Is there a specific item that stands out as the most expensive on their menu, or is it a combination of items that really racks up the price? I'd love to know the details, especially if it's something I've never tried before!