Everybody knows that people do not have access to water, but they aren’t always thinking about it. This ad raises awareness and makes you feel guilty about buying water in a machine, when other people have no access at all; thus people will donate money to UNICEF.
This ad is very confrontational. Although it can be embarrassing for some, it does get the point across and might humiliate a person into joining the gym. This may not be the most inspiring ad, but it is still upfront and works.