The WWF Earth Hour commercial for 2011 is both smart and hilarious. The commercial starts off with a group of guys who are hanging out at night, having a drink together. One of the men makes a comment that since it's Earth Hour, his friend should probably turn off his house lights. The friend ignores this and shortly after the friends get pummeled by a mass amount of moths who are being attracted by the light. The tagline from the video reads "don't be the only one."
The advertising agency behind this clever and memorable WWF Earth Hour commercial is Leo Burnett in Sydney, Australia. Creating a commercial that makes others laugh will have a greater impact on people because they are more likely to remember the message.