Yelling while defending?

[Nevadaref]

Originally Posted by Rev.Ref63

What would you consider as "extreme behavior?" How would you deal with it?

Following an opponent around the court closely and staying right in his face.

Seriously:
One player coming up being an opponent and yelling, "Look out!"
Similar to the hand near the eyes rule, I wouldn't find it acceptable for a player to attempt to scream directly into an opponent's ear.

Both of these situations deal with physical health and safety.

I would charge a unsporting foul to the player.