Open Happiness font here refers to the font used in the logo of Open Happiness, which is a Coca-Cola ad campaign rolled out in 2009, following its “Coke Side of Life” ad campaign.
The font used for the campaign logo is probably Gotham Book designed by Tobias Frere-Jones in 2000. The typeface is commercial one available in multiple weights and several variations. More details about it can be found on Typography.com.
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The Gotham font identified above is not available for free, please follow the link above and purchase the font. Meanwhile, you can take a look at our collection of fonts for cars, pop music and apparel as well as round-ups of new & fresh fonts around the web.