Luke in season 3
Especially in the first few seasons,the writers experimented a lot with Luke. In the first two seasons he was a weird kid,in season 4 and 5 he was a muddler boy,and in season 3,they made him a 'bad and sarcastic boy' who often made jokes Repubblican-style,like for example:
Manny: "We could go live in Canada"
Luke: "If you like taxes.."
Well,that version of Luke was hilarious! And they made a good duo with Manny. Too bad they changed him again in the following seasons,i would have loved this version of Luke to stay.