I notice that in the head to head, if the question gets passed from the first player to the second, Ben presses the second player for an answer, any sort of answer, they don't seem to be allowed to pass, or say, "I don't know", even if they've absolutely no idea. Hence there's a lot of daft answers given that the contestant knows have no chance of being right, but it seems they have to say something.
In a pub quiz, as a friend of mine is fond of saying, any answer is better than a blank space. Only your team and the quizmaster will see it, no matter how daft your answer is.
But on a TV quiz show, if you've no idea, and the question isn't really guessable, but you have to say something, you often end up just looking silly. The Renaissance one today being a good example. (Answer given "Can-can" , which she knew had no chance of being right.)