Politeness
Family Guy example. All of my posts will be regarding FG and the analysis of funny quotes from the show. Anyway...
Lois: Brian, you're not wearing the sweater I
made you.
Brian: Well, y'know, it's a little warm in here ...
Lois: Don we now our gay apparel!
Brian: It doesn't get much gayer than this.
Brian's response is not the preferred response so Brian must use more
language to explain himself. He would've said more but Lois cut him off. Also "Well, y’know" is letting Lois know that he is
about to flout the maxim of politeness and relevance. He isn’t giving her the preferred
response but he is making up for it by paying the penance (having to come up
with an excuse). It should also be noted that "Brian, you're not wearing the sweater I made you" is a speech act. She is trying to get Brian to go put it on.