Here's a semi-famous clip of Steve Allen on some TV show laughing his fool head off. One of the many assets that Mr. Allen had going for himself was that he was a great audience for the many great comedians who appeared on his programs…and as you can see in this, he was even a great audience for himself. Once in a while, you'd see Johnny Carson break up like this…and of course, Red Skelton would laugh if a fly got into the studio or Harvey Korman would lose it if the fly was Tim Conway. But for the most part, you don't see today's TV performers ever laughing much on the air. Just an observation.