Ja Rule had to discipline a fan who felt it was cool to throw a beer can at him during his live performance.

The "Holla Holla" rapper was performing a show at Harrah's Pool After Dark in Atlantic City when during his rendition of his 2004 hit “New York," Ja caught a crumpled beer can to his dome by someone in the audience.

“Who threw that?” the enraged rapper demanded after asking the DJ to cut the music.

The Queens rapper stopped his show to find the culprit who hurled the can at him. Ja went even further to offer a $1,000 bounty on the transgressor. The crowd quickly pointed out the beer-can thrower and he was immediately pushed to the front of the stage.

When Ja confronts the person who threw the can, he calls him to the stage and slaps the crap out of him. Frustrated, the former Murder Inc. rapper then leaves the stage and there’s no word on how or if he continued the remainder of his set.

The lesson: Please don't throw objects at the stage while a rapper (or singer) is performing a show. The end result could be a slap to the face.

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