Guerrilla marketing is the art of catching and grabbing the viewer's attention by placing the unexpected in common places. The unconventional can deliver a powerful message as the following images show.

These disturbing images placed in the bottom of shopping carts by Feed SA, a South African charity dedicated to feeding disadvantaged people, resulted in both a large increase in donations plus a big boost in website traffic from people wanting to learn more.

Tired of people spray-painting graffiti on their buses and trains, the Australian Public Transport Authority targeted the ‘graffidiots’ with this ad campaign reminding would-be vandals what the consequences of their actions could be.

A blank set of elevator doors features two sets of fingers peeking out from the seam, as if someone inside is trying to escape. Inside the elevator the owner of those fingers: a man in a prison jumpsuit and leg-cuffs. Witness Against Torture, a human rights group, used this ad to campaign for the closure of the Guantanamo Bay detention center.
With creativity, powerful emotions can be created with teh most simple of tools.