Not even Furman players themselves could believe Virginia lost the way it did to kick off March Madness on Thursday ... with Paladins star forward Jalen Slawson yelling after the improbable win, "He just freakin' threw it!"
If you missed it ... UVA, a 4 seed, lost to 13-seed Furman on a last-second 3-point shot -- after one of the most embarrassing turnovers you'll see in an NCAA tournament game.
Up by 2 over Furman with 9.8 seconds left -- Cavaliers guard Kihei Clark got trapped in a full-court press, but instead of finding a way out of it, he just heaved the ball toward mid-court -- where it was predictably intercepted.