@dean_exia: http://tvtropes.org/pmwiki/pmwiki.php/Main/Expr...

dean_exia
2012-01-26T04:04:15-05:00

http://tvtropes.org/pmwiki/pmwiki.php/Main/ExpressiveAccessory

An item that changes based on the expression or condition of its master, though it usually has no reason whatsoever to do it.

I like to bring this 'expressive thing' up too, because of post #861246.