An addendum..this is right from the NFHS case book...
Same situation happens, with R1 on third and R2 on 2nd. R2 attempts to steal 3rd base, EVEN THOUGH IT IS OCCUPIED. If catcher interference is called, R2's attempted steal gives him 3rd base (regardless of the fact that it was already occupied), which forces R1 home.
Sorta goofy, since if R1 was not stealing home and R2 is doing something stupid, he ends up being awarded for it.
