In his public-speaking class at Los Angeles City College, Jose Barrientos has spoken in front of his classmates in a Mexican accent about his idol, actor David Hasselhoff, and the history of Cinco de Mayo. But in the final speech of the semester last week, Barrientos, 26, an aspiring comedian, ditched the intonation he had been using since August to reveal that he had pulled a prank on all of them.

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