Here's the full (and utterly delightful) fan video that's causing such a stir:
The song creator himself expressed his disappointment over the situation:
It's beyond sad these kids were arrested for trying to spread happiness http://t.co/XV1VAAJeYI
— Pharrell Williams (@Pharrell) May 21, 2014
And contrary to the actions of Tehran police, Iran's president later tweeted words of support, presumably, for the young people who were arrested:
" #Happiness is our people's right. We shouldn't be too hard on behaviors caused by joy." 29/6/2013
— Hassan Rouhani (@HassanRouhani) May 21, 2014
Update: Since this story broke, several of the people involved in the video have been released, but the video director remains in custody. We've yet to know what legal repercussions they'll face.