7. Discovering Internet Porn
Quagmire turns up at the Drunken Clam in the episode "Family Goy" and asks his friends if they've seen the recent swimsuit edition of Sports Illustrated. Joe informs him that such illustrations don't excite him any more, now that he's been spoiled by internet porn. Quagmire, confused, has never heard of internet porn (which comes as something of a surprise, given his nature) and immediately sets out to discover more about it. He is then seen emerging from his house the next morning looking exhausted and, when he points towards his mailbox, it is revealed that his left arm has suddenly become very muscular - no doubt thanks to the "activity" he's been indulging in whilst exploring the pornographic delights of the internet.