Judging by the almost 4 million views already on YouTube, I'm probably the last person to hear about this video. But what do you get when you put the above three words together? Courtesy of Wikipedia, here's what I found.
Pinoy: Pinoy is a demonym used by Filipinos for their compatriots in the Philippines and around the world. Prisoner: A person incarcerated in a prison or jail or similar facility.
Thriller: Thriller is a 1984 hit single recorded by Michael Jackson.
Being a Filipino-American myself, I'm not sure whether to take pride in this video, or be really embarrassed. I mean, this is prison! I'm trying to think about how all of this was organized. And, in doing more YouTube searches, this is not the only song that this group does. Oh well, what did you think the first time you saw this?