Filipino Prison Inmates Dance Thriller

byronfgarcia's youtube description says that this is: 1,500+ CPDRC (Cebu Provincial Detention and Rehabilitation Center) inmates practicing "Thriller". Not a final routine and definitely not a punishment! Just a teaser.

Is this the Philippines' response to India's Bollywood version of Thriller (over 3 million views)? One of the funniest videos I've seen in months but it raises more questions than answers! What's the punishment for not dancing? Who choreographed? And why do they also have their version of Sister Act's "Hail Holy Queen" and "I Will Follow Him"?