ALL live-audience shows have people who come out and 'warm-up' the audience. They infuse the audience with energy and teach them how to applaud 'quickly', so as to make the applause sound louder and more enthusiastic. They say 'funny thing's to get everyone laughing, and encourage everyone to laugh loudly and often.
By the time the show starts the excitement of being in the studio, the warm-up activities and the energy of seeing a tv show (which is thrilling to those who get tickets) has people ready to laugh and participate with enthusiasm.
During the show there are applause lights which prompt the audience, as well as the 'warm-up guy' running around in front of the audience encouraging louder applause and more laughter.
It really doesn't matter what is said in the monologue. People will laugh and participate, and think they're having a good time.
Every television show with a live audience has the same formula.
It works.
"Two drifters off to see the world. There's such a lot of world to see. . ."