a flier a friend of mine made a few years ago. not sure if this counts as guerrilla marketing, but I've always found it clever/humorous.

Good Billboards

Speed Control

My dad sent me this a while ago, it was a campaign to slow cars down on busy roads. Not sure where its from though.

To introduce the TV show “The Practice” a two-way mirror effect was created in the restrooms of movie theatres.

Advertising Agency: Marcel, Paris, France

Creative Directors: Anne de Maupeou, Frederic Temin

Art Director: Alexandra Offe

Copywriter: Vanina Guillier

Published: March 2009

via http://www.ibelieveinadv.com/2009/06/jimmy-channel-two-way-mirror/

I thought this was pretty interesting and unexpected

Guerilla

This one is pretty fresh:

http://gizmodo.com/5527460/billboard-sucks-you-into-the-scene-of-a-violent-crime?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+gizmodo/full+(Gizmodo)