The great philosopher Pharrell Williams once said: "Clap along if you feel like a room without a roof. Clap along if you feel like happiness is the truth." 

While we're not entirely sure on the whole room/roof metaphor, we think we've worked out the subtext — happiness = a good thing.
 
And an easy way to bring some sunshine and happiness to your day is by bagging one of these cool slogan tees. Get 'em on and share your positive summer vibes with everyone you meet.