I really love Red Dress, Hal's Christmas girft, Lois battles Jamie, Halloween Approsimately, Dwey's Dog, Blackout, Hal's Birthday, Company Picnic, Bomb Shelter, Malcolm's Girlfriend, Evacuation, Minibiike, and Smunday.
But my all time favorite would have to be Flashback.
I don't really like seasons 4, particularly the episodes Family Reunion, and Grandma Sues...I do like some, like Forbidden Girlfriend, though