Edna Krabappel, commonly known as Mrs. Krabappel, is a fictional character from the animated television series The Simpsons. She was voiced by the late Marcia Wallace and first appeared in the episode 'Bart the Lover'. She is a 4th grade teacher at Springfield Elementary School and is often seen with her catchphrase, 'Ha ha!'. Edna is an important part of the show, often providing comic relief and being involved in various storylines.