Ambush marketing is a very controversial form of marketing strategy. A company will utilize an event to advertise its product or service, sometimes even taking it to the extreme by making its appearance as disruptive as possible. This strategy originated from promotional campaigns that took advantage of large cultural events, such as concerts or sporting events. You would usually see people wearing shirts with the logo of the company they are representing.
Ambush Marketing has been used since at least 1970 when a group tried to hijack a Woodstock concert and sell Coca-Cola to everyone who attended for $1 per can (during the time there was no such thing as “Coke machines,” and you were limited in how many cans you could buy).