Funniest stand up routine I ever heard was this guy talking to his wife on the phone after she tracked him down from a two day drunken binge,
"Yes dear, yes dear, I know that I'm sorry dear, my dad was sorry, my son Rick has a sorry streak and his little boy Bubba will grow up sorry, honey if I thought it would do any good I would go dig Dads ass up and kick it."
Guess what made this so funny was it was true life improvisation.