Every so often, 50 Cent reminds us that there's still some juice left in the tank -- and last night was one of those moments. Out of the blue, an unreleased track -- originally titled 'Don't Turn On Me,' but later renamed to 'Warning You' -- from the G-Unit general surfaced online.

The song's produced by Alex Da Kid and features Skylar Grey, and it's exactly what you'd expect to hear from the Alex-Skylar tag-team; bruising drums, stadium-status synths and an anthemic hook from the Wisconsin crooner that's brimming with emotion. Fiddy brings the goods, too, as he shrugs off murmurs that he's washed up.

According to recent tweets, 'Warning You' was recorded in Detroit with Eminem over a year ago, and it sounds like it was intended for 50's upcoming 'Street King Immortal' album (which, by the way Fif, we're still waiting on).