Episode - If I'm Dyin', I'm Lyin'
Title: Lying
"Hey, Dad." Chris asked Peter, "When you said, 'Chris finished his homework', were you talking about me? 'Cause if you were, I think you just lied to Mom."
"Now Chris, lying's not all that bad." Peter told Chris, "In fact, lies can be quite helpful."
"How?"
"You know that your science teacher, ol' Fargus has to take those chill pills to keep his job?"
"Yeah."
"Truth is, he lied about taking them and just tone down the insanity. And what did he teach you in class today?"
"We went into one of his pinball games to experience motion."
"Well, you can thank lying for that."