Urban areas are filled with terrorists, feminists, liberals, and murderers. Which one is not like the others? Murderers because they don't pretend to have a cause.
Which One Is Not Like the Others?
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Explanation
Experiment
The joke is comparing groups of people with the assumption that feminists, liberals, and terrorists have no real cause, while murderers do not pretend to have one. The joke uses an "which one is not like the other" style to frame its punchline.