Guerrilla advertising encompasses all forms of non-traditional methods of communication. They can be open and honest like environmentally friendly high-impact street advertising or subversive like supermarkets pumping up the smell of fresh bread at the entrance. Guerrilla advertising is exposure that is unconventional and unexpected. It can be anything from street teams in costume to abnormal promotional exhibits to provocative street poster campaigns. Basically, guerilla advertising can be anything that is not used on a mass scale already.