On Saturday during what was declared the National Day of Resistance, Samuel L. Jackson evoked modern-day protest methods and took to Facebook to ask celebrities to call out police brutality in song.

"All you celebrities out there who poured ice water on your head," Jackson said in reference to the ALS ice bucket challenge craze earlier this year, "I challenge you to do something else. I challenge all of you to sing the 'We Ain't Gonna Stop till People are Free' song."

The actor then sang the lyrics to the song in his 48 second clip:

"I can hear my neighbor cryin' 'I can't breathe' / now I'm in the struggle and I can't leave. Callin' out the violence of the racist police. We ain't gonna stop till people are free."

Jackson's invitation came on the same day as the National Action Network's Justice for All March and New York City's Millions March, both in protest to police brutality as a response to recent killings of unarmed black men like Michael Brown and Eric Garner by the police.

After Officer Darren Wilson killed unarmed black teen Michael Brown in Ferguson, Missouri, in August, actor Orlando Jones also referenced the ice bucket challenge in a video for his "bullet bucket challenge" calling for an end to police brutality. Jones poured a bucket of bullets over his head saying, "Every shell casing in that bucket represents the life of someone who fought and died in the goal for civil rights and human dignity."

[People]