Batman: The Animated Series Season 1 Episode 11
An offhand remark by Mayor Hill on television spurs the Joker into sneaking onto his estate disguised as a clown at the birthday party for Hill's son, Jordan. Joker plants a bomb, but Bruce Wayne, who is attending the party, manages to defuse it. However, Jordan, who is angry at his father, runs away hiding in Joker's van.
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