We’ve had an obsession with YouTube phenom Keenan Cahill for a while here at INF Daily, but we couldn’t really figure out what his deal was. Is he a kid? A little person? A teenage little person? We still don’t have any answers to that, but Keenan’s fame is now reaching far beyond YouTube. Turns out none other than 50 Cent is a fan of Keenan’s supremely committed lip-synching videos. The rapper showed up in in the guy’s messy bedroom to sing along to “Down On Me” – and it aired on Chelsea Lately last night. 50′s at the 1:20 point.