Heidi at HeiDeas collects linguistically relevant Simpsons jokes:
bq. Origins of English
Homer: English? Who needs that? I’m never going to England.
bq. Lisa tries to learn Italian. Milhouse, who has been covertly bilingual all this time, is her instructor.
Luigi comes up to Lisa and Milhouse in Little Italy.
Luigi: Mr. Milhouse — thanka gooddness! Could you trannzlate an helpa me my cheese for my lasagna
Lisa: But Luigi! Surely you speak Italian!
Luigi (sighs): No I dont. I only speak ahh, how you say, um, fractured Englisha thats what my parents spoke at home.