Chester "Snake Jailbird" Turley is the constantly recurring convict on The Simpsons.  Even if he's not busy robbing poor Apu's Kwik-E-Mart, he's usually seen getting arrested for something during most of his scenes.

Snake Jailbird Quotes

Use a pen, Sideshow Bob!

Snake

Chief Wiggum: I'm gonna let you in on a little secret. Cops don't have a lot of friends. Civilians are afraid of us and other cops just remind of us things we want to forget. That's why your friendship is so special to me.
Homer: Chief, me too.
Snake: Umm, you know I've been back here for like ten hours. Any chance of a bathroom break?
Chief Wiggum: Thanks a lot jail bird. Now I have you on burglary and killing a moment.

The Simpsons Quotes

(Bart shows the whole classroom the tape for his project called, "How Kittens Are Born: The Ugly Truth")
Bart: and here comes Snowball II. This is the one we kept.
All: EWW!!
Bart: We were gonna keep the gray one, but the mother ate her.
All: EWWWWW!!
Martin: Mrs. Krabappel, he's traumatizing the children!
Mrs. Krabappel: As usual, I agree with you, Martin. Bart, shut that off and take your seat immediately!
Bart: Oh, look! This is really cool. When I hit reverse, I can make 'em go back in.
(The whole classroom screams)

Homer: (Wearing glasses) The sum of the square roots of any two sides of an isosceles triangle is equal to the square root of the remaining side!
Man: (From inside a bathroom stall.) That's a right triangle, you idiot!
Homer: D'oh!