Ten top UK comedians face off in Jimmy Carr's challenge: make others laugh while keeping a straight face. They'll try everything to crack their opponents, but must never break themselves.

Ten top UK comedians face off in Jimmy Carr's challenge: make others laugh while keeping a straight face. They'll try everything to crack their opponents, but must never break themselves.

Ten top UK comedians face off in Jimmy Carr's challenge: make others laugh while keeping a straight face. They'll try everything to crack their opponents, but must never break themselves.

Ten top UK comedians face off in Jimmy Carr's challenge: make others laugh while keeping a straight face. They'll try everything to crack their opponents, but must never break themselves.

Ten top UK comedians face off in Jimmy Carr's challenge: make others laugh while keeping a straight face. They'll try everything to crack their opponents, but must never break themselves.

Ten top UK comedians face off in Jimmy Carr's challenge: make others laugh while keeping a straight face. They'll try everything to crack their opponents, but must never break themselves.

Ten top UK comedians face off in Jimmy Carr's challenge: make others laugh while keeping a straight face. They'll try everything to crack their opponents, but must never break themselves.

Ten top UK comedians face off in Jimmy Carr's challenge: make others laugh while keeping a straight face. They'll try everything to crack their opponents, but must never break themselves.

Ten top UK comedians face off in Jimmy Carr's challenge: make others laugh while keeping a straight face. They'll try everything to crack their opponents, but must never break themselves.

In 'LOL: Last One Laughing,' comedians are forbidden to laugh as Philippe Geubels and Jeroom Snelders challenge ten Dutch comics to keep a straight face while trying to make each other laugh.