Guerrilla marketing is an unconventional marketing technique that achieves maximum results with minimum budgets. It was inspired by guerrilla warfare tactics during the Vietnam War. It is creative, subtle, quirky, and ensures brand uniqueness in a cost-effective way. An example of bad guerrilla marketing was when Microsoft pasted thousands of butterflies around Manhattan and was fined. Nissan's campaign of leaving "lost" key fobs around the city with messages implying keys were not needed generated positive buzz. Guerrilla marketing triggers emotional connections and enables creative, out-of-the-box thinking to sell ideas rather than just products.