You're Caught -- Stop Your Wining:

The King of Freedonia has caught 10 spies from the Kingdom of Sylvania who
attempted to poison his wine. The King of Freedonia keeps 1000 bottles of
wine in his cellar. The spies managed to poison one of the 1000 bottles but
were caught before they could poison any more. The poison is a very special
one that is deadly even at one-millionth the dilution of the poisoned wine
bottle and takes EXACTLY 24 hours to kill the victim, producing no symptoms
before death.

The trouble is that the King doesn't know which bottle has been poisoned
and the wine is needed for the Royal Ball in exactly 24 hour's time! Since
the punishment for attempted regicide is death, the King decides to feed
some of the wine to the spies. The King informs his wine steward that he
will be able to identify the poisoned bottle by the time the ball starts
and kill at most 10 of the spies. Further, each spy drinks only once. 
How does he do it? Problem passed on by Elida Flores, titled by yours truly, 
phrased by Eric Adelizzi, inspired by Rufus T. Firefly. (FOR THE EXPERTS: 
YOU CAN DO IT WITH AT MOST 8 PEOPLE DYING!!!)