T.I. finally witnessed the showdown that's been building for weeks -- between 2 of his homies -- and it left him laughing his ass off!!
The rapper was leaving Crustacean Sunday in Bev Hills when his crew decided it was time to settle a dispute -- who's the fastest man alive? On tour ... on that particular day ... with T.I.?
Tip -- who's in the middle of his Hustle Gang Tour -- picked the winner, and also worked traffic control. They raced in the middle of the street, after all.
T.I. was laughing, but the loser had to pony up a G!