all the simpsons up to season 7 and family guys precancellation are great episodes
FYP
Personally my favorite is:
The only monster here is the gambling monster that has enslaved your mother! I call him Gamblor, and it's time to snatch your mother from his neon claws!
or the classic:
TV: So call me now! $5 for the first minute, $2 for each additional minute!
Homer: [dials the number]
Voice: You... have reached... the Coach's... Hot-...
Homer: Line.
Voice: Line.
Homer: Yeah, lay it on me, Coach.
Voice: In the game... of... Mi... am... i...
Homer: Mm hm.
Voice: Versus Cin...
Homer: Cincinnati.
Voice: cin...
Homer: Cincinnati.
Voice: nat...
Homer: Cincinnati.
Voice: i...
Homer: Come on, come on, don't you realize this is costing me money!
Voice: We must consider... many... things.... The wind...
Homer: D'oh, not the wind!
Voice: Is blowing out of the....west.
Homer: Oow...
Voice: At five...
Homer: Miles per hour!!!
Voice: knots...
Homer: D'oh, this is ridiculous!
and later that same episode:
Smooth Jimmy Apollo: [explaining his poor prediction]
Well, folks, when you're right 52% of the time, you're wrong 48%
of the time.
Homer: Why didn't you say that before!!