[BillyMac]

Certainly not historical, but this is from my list of The Most Misunderstood NFHS Basketball Rules:

The backboard has nothing to do with goaltending. Goaltending is when a player touches the ball during a try, or tap, while it is in its downward flight, entirely above the basket ring level, outside the imaginary cylinder above the ring, and has the possibility of entering the basket. On most layups, the ball is going up immediately after it contacts the backboard, and in this situation it is legal for a defender to touch the ball if it is not in the imaginary cylinder above the basket. Slapping or striking the backboard is neither basket interference, nor is it goaltending, and points cannot be awarded. A player who intentionally or deliberately slaps or strikes a backboard, during a tap, or a try, so forcefully that it cannot be ignored because it is an attempt to draw attention to the player, or a means of venting frustration, may be assessed a technical foul. When a player simply attempts to block a shot, and accidentally or incidentally slaps the backboard, it is neither a violation, nor is it a technical foul.