By this time you will have eaten my cookies and will be wanting a palette cleanser. On the table in the far corner you will find two glasses of milk. One contains a poison that is odorless, tasteless, dissolves instantly in liquid and is among the more deadly poisons known to man.
So, where is the poison? The battle of wits has begun. It ends when you decide and we both drink -- and find out who is right, and who is dead.