OK, so how about those Brooms Sticks......

[Steve Vander Ark]

No: HPFGUIDX 4842

--- In HPforGrownups at egroups.com, "Denise Rogers" <gypsycaine at y...> 
wrote:
> Steve, 
> What about the game where Harry is literally hanging on by his 
hands to the stick?  The bubble isn't there for that.
> 
> Dee    

That gets right back to the whole concept of intention as being 
vitally important in understanding the way magic works. In this case, 
the "bubble" protects where it's intended to protect. It doesn't 
protect from the various dangers of the game itself or there'd be no 
sport. In effect, the "bubble" charm knows the difference. It's not 
intelligence exactly, or at least not intelligence in the spell 
itself. It's the intention, the intellience, of the spell caster. 

Steve Vander Ark
The Harry Potter Lexicon
http://www.i2k.com/~svderark/lexicon