“Marriage is like a coffin and each kid is another nail”- Homer Simpson's quip in How I Spent My Strummer Vacation (2002). The Simpsons was created by Matt Groening and developed by Groening, James L Brooks and Sam Simon. Lisa, Marge, Maggie, Homer and Bart first appeared on April 19, 1987, as a cartoon short The Tracey Ullman Show. It is now America's longest-running sitcom. As The Simpsons celebrate their 30th birthday, Martin Chilton picks their greatest quotes.