It’s called Would I Lie To You. It’s on the BBC in the United Kingdom.
It’s a comedy/quiz/panel show. Two teams of comedians, or actors or journalists or whatever are pitted against one another. They are given a statement to read, and the other team has to work out whether or not the statement is true, they ask questions and delve into the statement searching for the truth. If the statement is a lie, then the person who read it out has to improvize a quick, truthful sounding true story. This often results in moments or pure, genuine hilarity.
Go watch it!