Guerrilla marketing is a low-cost, unconventional marketing technique that aims to get maximum customer attention. It uses creative tactics instead of large budgets. Tissue-pack marketing is a type of guerrilla marketing where small, portable tissue packages with advertising are directly handed to consumers. Astroturfing refers to fake grassroots campaigns that are actually planned by an organization to influence public opinion. Ambush marketing is when a company not sponsoring an event still advertises using the event to draw customer attention without paying sponsorship fees. Neuro marketing developed in 1990 and uses knowledge of subconscious brain activity to inspire desired perceptions and reactions in people.