A chimpanzee shows an electrical battery to a lion, an elephant, and a hippo. It then wires them to the battery, and walks away as they are electrocuted.
<bdi><a href="https://en.wikipedia.org/wiki/en:Jimmy_Swinnerton" class="extiw" title="w:en:Jimmy Swinnerton"><span title="American cartoonist and painter (1875-1974)">Jimmy Swinnerton</span></a>
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1899-11-12
<i>New York Journal</i> (via <i>Origins of the Sunday Comics</i>)