Couple things I want to clarify...

Originally Posted by Back In The Saddle

I tell people that the front, sides, top, and bottom are in; perhaps it would be simpler if I told them, "Only the back of the backboard is out."

I generally tell them that there are 6 sides to the backboard but only 1 is OOB.
As they attempt to figure it out, the look on 85% their faces is PRICELESS!

[JugglingReferee]

Originally Posted by Ch1town

I generally tell them that there are 6 sides to the backboard but only 1 is OOB.
As they attempt to figure it out, the look on 85% their faces is PRICELESS!

Consider it stolen!

[referee99]

... that the back bottom edge of the board (shared by the bottom plane and the back plane) is 'the back of the board', yet I would never call it OOB (as long as the pass bounced downwards)?

[JugglingReferee]

Originally Posted by referee99

... that the back bottom edge of the board (shared by the bottom plane and the back plane) is 'the back of the board', yet I would never call it OOB (as long as the pass bounced downwards)?

I don't believe that the edge belongs to both the bottom plane and back plan. I think the edge is by definition, infinitesimally thin.

[Back In The Saddle]

Which means that the way the ball rebounds after hitting the edge results not from hitting the edge, but from hitting one of the planes that intersect at the edge.