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"Pulp Fiction" star and Marvel mainstay Samuel L. Jackson has a new challenge for celebrities who helped make the ALS Ice Bucket Challenge so successful this summer. He wants them to use that social media power to raise awareness for the protests happening around the country following a New York grand jury's decision not to indict a police officer in the choking death of Eric Garner. "All you celebrities out there who poured ice water on your head, here's a chance to do something else," Jackson says in a video posted to Facebook. "I challenge all of you to sing the 'We Ain't Gonna Stop Till People are Free' song." He even got the ball rolling himself:


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