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LAKE WORTH, Fla. -- An 18-year-old was charged with abuse after putting a gun into his mentally incapacitated 85-year-old grandmother's hand and forcing her to shout profanities for an online video on thug life in Palm Beach County, police said.

Officers in Lake Worth said Michael Alfinez admitted that he dressed up his grandmother and told her what to say, according to a sheriff's report.

The 85-year-old, who appears disoriented, can be heard shouting curse words and making statements like, "This is for all the pigs" and "I'll shoot you," a Palm Beach Post story reported.

Alfinez said a producer of the "Gangstas and Thugs" videos contacted him through MySpace.com and asked for footage of his grandmother, the report said.

Alfinez admitted to firing off the same chrome pistol seen in his grandmother's hands from a car window, Local 6 reported.

He was arrested on charges of elderly abuse, discharging a firearm in public and improper exhibition of a dangerous weapon.

Deputies said they found the video during a traffic stop.

Watch Local 6 News for more on this story.