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

(The family watches Homer's launch on TV.)
Bart: Go, Dad, go!
Lisa: How doth the hero, strong and brave, a celestial path to the heavens paved!
(The family stares at her.)
Lisa: Go, Dad, go.

Mr. Burns: I specifically said, no geeks!
Milhouse: But my mom says I'm cool...