WATCH: Bill Hicks' Banned David Letterman Appearance When he was dying of cancer, Bill Hicks went on David letterman's show and did some typically brilliant and important stand up. David LEtterman, in his gatekeeping wisdom, deemed the material unfit for human consumption, and refused to air it.

Many years latter, he decided to make a public apology for his actions, and invited Bill's mother on to his show, and aired the previously banned footage.