The way I figured it, one says the name of an actor, then the next person names a movie they were in, & the next person names someone different in that same movie, etc.
So when Rex named Bird on a Wire, you could say Goldie hawn, then I'd say Death Becomes Her, and you could come back and say Bruce Willis, so on and so forth.
If this in incorrect then someone else might need to explain it to me. ; = )