"Opportunity Knocks was a short-lived primetime family quizzer where the game took place around a family's home, and the contestants were the family themselves."@en . "Opportunity Knocks was a short-lived primetime family quizzer where the game took place around a family's home, and the contestants were the family themselves."@en . . . . . . . . "Opportunity Knocks (2)"@en . . . . . . .