http://adsoftheworld.com/media/outdoor/toronto_academy_of_karate_board

I found this to be an interesting outdoor ad because these type of fold-up signs are usually very boring and plain. Most are usually just whiteboards with words, but I like how this ad is able to employ the show the effect technique. It is also an easily recognizable connection between the broken board and karate lessons so I found it very effective.

http://adsoftheworld.com/media/outdoor/calgary_zoo_trashman

This ad for the Calgary Zoo is funny and eye-catching. I don't know how effective the ad actually was, but I would bet the return was pretty good especially considering that this would be very easy to do and spread city-wide. I'm not sure why the zoo would have a dinosaur exhibit unless they recreate Jurassic Park or something, but this ad would definitely pique my interest.

http://adsoftheworld.com/media/outdoor/ymca_basketball_billboard

I like this ad for the YMCA for its simplicity. The billboard as a backboard on a basketball hoop pretty clearly, I think, conveys the idea that by helping the "Y" you can help provide basketball hoops and other things for kids to use to help keep them out of trouble. Simple but effective.