Late night talk shows used to be places considered to be the breeding grounds of new comedy, as their lowered expectations of their time slot would generally free up the host to experiment in more off-the-wall strains of humor. (In fact, this is what Conan O’Brien critical acclaim back when he hosted
Late Night, and why so many people love the job that Craig Ferguson does hosting
The Late Late Show.) But as these kinds of shows became more popular, and the networks became aware of the significant numbers of middle-Americans who watch these shows because of their earlier airtimes in those time zones, the shows began to temper their humor, in an attempt to reach the largest possible audience base. Yet every once in a while, some hosts will break past these unofficial barriers, by taking part in some cross-show bits/sketches.