The one that Dale Winton used to do before the Lottery on a Saturday night - the people on that used to get on my nerves
"Well, Dale, I don't know the right answer" would be the first words out of their mouths. They would rule out the right answer straight away, then usually plump for the right answer.
There was a woman on The Chase the other day doing something similar, saying "that was a hard one for me, Bradley" - they would have been hard for a lot of people, but you don't hear half the other contestants muttering the same...