This is from a UK game show. The aim is to put the pile of money on the right answer, or if you're unsure you split it between multiple answers. Whatever money was on the right, you get to use for the next question - after 8 (I think) questions, you get to keep whatever you have left.
The girl here didn't listen to the complete question, so is answering a different question. The host of show repeats the question very clearly several times, but the girl still doesn't notice.
The combination of high stakes (£1,000,000 in this case) and time pressure are clearly too much for the couple. The girl will probably feel like it was her fault, but I found what the guy did quite interesting as well - he can see the answer makes no sense, and tries to point out the correct one. But the girls confidence in her answer makes him go along with that one, even though it makes no sense.