In the episode where Bart burns down the Christmas tree and blames it on an imaginary burglar, Marge goes on Jeopardy! to try and win some money to pay back the neighbours. When you see this clip, you see that the Final Jeopardy music is playing, and that Marge is still there. However, she has -$5200, and any Jeopardy fan knows that they don't even let you on the stage to play final Jeopardy if you have a negative score.