Ozzy--the throw counts if it hits foreign objects as long as the dice remain on the table and land on the felt. For many unfortunate dealers and players alike, even when some rookie throws with all his might and the dice may kick up and hit you in the face (or more dangerously, the eye), it still is valid.
the throw counts even if one or both die don't hit the back wall, but repeated throws like that garner a warning, or someone such as I screaming, "make it hit the back wall!" (Being a "don't" player, I haven't picked up the dice in 20yrs, but one time I threw and one die slipped out on my throw and went 1/2inch while the other went the length of the table. I thought the short die was invalid, and god help me to this day that my arm wasn't broken when I went to reach for the die that was short...!!)
Finally, "Parachute" rolls are prohibited from going higher then the eyes of the dealers and esp. the stick b/c his job is to watch the dice from shooters hand to flight in air. Again--repeated stratosphere rolls are met with a stern warning.
Going back to the Blackjack thread, I'm with Beadman in his comment. Slinky don't crucify me, but doesn't the play of the anchor directly affect everyone? I'm still under the belief that the anchor has to be the guy who cleans up for everyone who makes a bad play, as well as take that hit on a 13 when the dealer has a 12 and no one else has taken a hit. I know, I know--that probably has nothing to do with anything except anectdotal blackjack, but I've always prayed that the anchor knows what he's doing--or at least, playing by the book to preserve the table "odds" in favor of the player.
In regards to "what would I do"--usually, if i see someone splitting 10s, or something crazy CONSISTENTLY, I leave the table. Interestingly, in Vegas, it's done a LOT, ie split 10s, and no one ever says anything. I was stunned.
And on the other hand, I've sat anchor and the guy next to me did everything "against" the book, while I played by the book. He got Blackjacks galore, and never hit his 15 or 16 against a dealer 8--and continued to win. I just sat and cried.
So I guess slinky is right!