Todd Williamson, Invision

After brief jaunts into the worlds of film, energy drinks and charitable work, sometime rap villain 50 Cent is back in the center of controversy, where he generally seems most comfortable.

Following his Twitter feud with business partner Floyd Mayweather, 50 is now going after Chief Keef, who apparently stood him up at the video shoot for the 17-year-old rapper's "Hate Being Sober," which also features Wiz Khalifa.

"@chiefkeef didn't show up to his own video. I never saw anything like this on the first song," 50 tweeted, then deleted. "Its not funny @ChiefKeef didn't sell any records yet,they will pull the plug on him.SMSAUDIO."

Until the botched shoot, 50 was an outspoken fan of the controversial young MC, who publicly joked about the shooting death of one of his rivals.

"I did a new joint to night with @chiefkeef he got some heat," 50 previously tweeted.

Chief Keef has yet to respond regarding the botched video shoot, but it's safe to say he's pretty unconcerned.