Floyd Mayweather successfully defended his WBC welterweight championship on Saturday, improving his career record to 47-0 -- which seems like a good reason for most people not to take shots at the boxing great. But, then again, 50 Cent isn't most people.

During the fight over the weekend, en route to his victory, Mayweather complained that his opponent, Marcos Maidana, bit his finger at one point. It was a bit of an odd sequence of events -- but also perfect fodder for Fif's latest virtual attack.

Building on what's become a tradition of creating lighthearted Instagram posts at Floyd's expense, 50 posted a video on Sunday taking a jab at his old friend by using a clip of the YouTube hit "Charlie Bit My Finger."

It's the latest in a string of back-and-forth between the two former best friends. Just in the last few weeks, 50 has questioned the boxer's reading ability, while Floyd came back and challenged the rapper to donate money to Michael Brown's family.

Another day, another example of 50 Cent's one-of-a-kind Internet trolling ways.