You guys named some good episodes!!
I'll just add on:
1) When Florida was going to do that commerical for Vit-O-Brite and they found out it was alcohol because Michael got drunk.
"Drink Vit-O-Brite and sleep tight"
2) The Christmas party at the taxi company when Thelma, Penny, Florida, and Wilona was singing: "We got...STEAM HEAT! We got...STEAM HEAT!"
3) Thelma and Keith'a wedding
4) ALL episode with Penny
My
FAVORITE was also the one with Wilona and Penny's real mom about to come to blows until Penny traps her with that tape recorder. Wilona straight slammed Penny's mom when she tried to attack Penny for that tape recorder.