Today is the “International Day of Happiness”. Therefore we give you the English, Danish and Swedish version of “If you’re happy and you know it”
The International Day of Happiness is celebrated throughout the world on the 20th of March. It was established by the United Nations General Assembly on 28 June 2012.
Assembly Resolution A/RES/66/281 states in pertinent part:
Balloons of Happiness
The General Assembly,
—United Nations General Assembly, Resolution adopted by the General Assembly on 28 June 2012 The International Day of Happiness Resolution 65/309 was the result of the effort the Kingdom of Bhutan and its Gross National Happiness Initiative. 
This UN resolution marked the historical milestone of globalizing the Happiness Development Movement that started in 1972.
You can read more about the Day of Happiness here: http://www.dayofhappiness.net/happy/