I often think the chasers give wrong answers on purpose, you can see it in their eyes - especially Paul Sinha. And anyway, there's nothing at stake for the Chasers, they get their fee whatever happens.
Postdog, No not everyone knew the answer to the cans question, why shoud they, sometimes things do slip peoples minds, yes even the experts. I don't think it was thrown, why should it be, like someone has said they get their fee regardless of winning or losing.