Slapping High Five at the Foul Line

[Loose Cannon]

I asked myself this question last night kind of out of nowhere while watching Cavs/Magic the other night. Where did the slapping high five with your team after the first foul shot come from? It kind of just dawned on me, but even after a guy misses, his team comes over and gives him a high five. And I have done it tons of times before and you've probably done it too if you've played competitive/organized basketball.

Actually, this whole thing dawned on me because one of the Cavs players hit a foul shot, but then nobody came to slap high five, so he had to walk over to somebody to get his high five in