I Thought My Life Would Be a Mardi Gras is a song by Marge during the production of Oh, Streetcar! in the episode "A Streetcar Named Marge".
Lyrics
Woman:
What's the matter, honey, are you lost?
Marge:
I'm lookin' for ma sister, Stella.
Ma name is Blanche DuBois.
I thought my life would be a Mardi Gras,
A neverending party...
Ha!
I'm a faded southern dame
Without a dime.