Guerilla marketing is an unconventional marketing technique that achieves maximum results with minimal resources. It started in the 1970s as advertisers found traditional advertising less effective. Jay Conrad's 1984 book on guerilla marketing techniques discussed using subtle marketing approaches. Guerilla marketing aims to be creative and thought-provoking to attract attention. While it can be risky if not executed properly, it is a cheap strategy that is worth trying for most campaigns. Both success stories, like Nissan's campaign about keyless cars, and failures, such as Microsoft's disliked butterfly stickers in New York City, are examples of guerilla marketing.