If you aren't having your own barbeque this 4th of July, you might want to borrow a Spider-Man costume and head to Carl's Jr. The fast food chain has a promo going on where they will give you a free Grilled Cheese Bacon Burger if you show up dressed as Spider-Man. Looks like some crafty folks living in big cities will be hitting up all of the local burger joints. Video promo after he break.