Remember the record-breaking medalist's fierce stare of determination during the Summer Olympics in Rio? It happened when the Maryland swimmer was preparing for a race in the 200 meter butterfly semifinal.
As South Africa's Chad le Clos was amping himself up by shadow boxing, Phelps created "the face." The face seemingly worked for the swimmer -- he finished second while le Clos finished fourth.
The swimmer made the revelation while introducing the rapper, who went onto perform a number of his songs, including "F--- Up Some Commas."