Sideshow Mel replaced Sideshow Bob after his incarceration as Krusty the Klown's assistant.  Sideshow Mel, born Melvin Van Horne,  is voiced by Dan Castellaneta.

Sideshow Mel Quotes

Sideshow Mel: Bleh! There's cheese in this sandwich! Surely you know I'm lactose intolerant!
Bart: Sorry.
Sideshow Mel: Sorry? Do you know how sick this is going to make me? Come stand next to the bathroom door, I want to yell at you some more.

Groundskeeper Willie: Come on ya pansies, I've seen fiercer fights in parliament
Sideshow Mel: What is this, prime minister's question time?

The Simpsons Quotes

Lisa's Brain: Poor predictable Bart. Always takes 'rock'.
Bart's Brain: Good ol' 'rock'. Nuthin' beats that!
Bart: Rock!
Lisa: Paper.
Bart: D'oh!

Homer: You're welcome to watch anything you want on TV.
Bart: TV Sucks.
Homer: I know you're upset right now so I'll pretend you didn't say that!