Nelson Mandela Muntz is a fictional character and bully from the animated TV series The Simpsons. He is voiced by Nancy Cartwright. Nelson was introduced in Season 1's "Bart the General" as a bully and occasional friend of Bart Simpson, who is best identified by his signature laugh ("Haw-Haw!").
Over the years, Nelson has terrorized virtually everyone in Springfield. However, he rarely associates with the other bullies of the school, namely Jimbo Jones, Dolph and Kearney, who form a separate clique of their own.
He shows the occasional glimpse of humanity, however, and other characters have occasionally warmed to him; Lisa dates him briefly in "Lisa's Date With Density", Marge informally adopts him in "Sleeping with the Enemy", and Bart is shown as a friend to him several times, such as in "The Haw-Hawed Couple".
Even in a life-or-death situation, Nelson laughs at the one in misfortune. Often, he makes his victim inflict self-punishment while yelling remarks like "Stop hitting yourself!", "Stop butlering yourself!", "Stop zapping yourself!", or "Stop endangering yourself!".
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