The comedian returns to his high school alma mater, St.
"It wasn't so much that I thought I wouldn't, as I did it was, it was never a good day to have one," Mulaney tells Letterman in the new sit-down, joking, "I was like, 'Oh, today's pretty packed.'" Mulaney's own father, Chip, joins for part of the special. A corporate attorney, he often makes appearances in his son's comedy routines as a serious and often stern paternal figure -- and Mulaney admits in the interview that it was hard to explain his show business aspirations to his parents.
However, while he aims to be a slightly warmer presence in his own son's life, Mulaney admits that there are lessons about parenting that he took from his childhood.