These are my Top 10 favorite episodes of The Simpsons:
Thirty Minutes Over Tokyo
Cape Feare
'Tis the Fifteenth Season
A Streetcar Named Marge
King-Size Homer
I Am Furious (Yellow)
Skinner's Sense of Snow
Brother from Another Series
She of Little Faith
Lisa on Ice
These "Bart ruins a holiday." episodes are some least favorite episodes of mine that I know off the top of my head. Why? They make me sad.