According to an article entitled 50 Cent Involved In Scuffle At Airport In Nigeria on AllHipHop.com 

American Hip-Hop star 50 Cent was engaged in a scuffle with the entourage of another rapper in a Lagos, Nigeria airport last night. 50 Cent was in the African nation taking part in the annual Star Mega Jam, which brings top name talent to perform along side popular Nigerian artists.

The incident started in an airplane belonging to the Aviation Development Company, before an aborted trip to Port Harcourt for a final performance. Eyewitnesses stated that Nigerian rapper Eedris Abdulkareem attempted to sit in a seat reserved for the internationally known 50 Cent, but was prevented from doing so.Abdulkareem’s entourage protested, resulting in a brawl inside the airplane.The scuffle carried on to the tarmac of the domestic wing of the Murtala Muhammad Airport, drawing the attention of employee’s and other passengers.

The rapper left without completing the performance due to the incident.

That's kinda messed up. I'm just glad this happened after my mom got 50's autograph when she interviewed him.