Normally, to set the tone, we open with some kind of faux-deep poem, or a pop culture reference, or something like that.
Unfortunately, best I can tell, the subject of cockfighting has never made it into the lexicon of mainstream America. The closest thing I can think of is that scene in Mad Men where Sterling Cooper puts a traditionally-dressed Chinese man with a chicken in Pete Campbell’s office as a “you just got back from your honeymoon” gag, or a scene from the movie Snatch where one of the bad guys owns a dogfighting ring.