Answer:
Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?
How do you blink twice without blinking twice?
What is the largest $ amount of change you can have in your pocket without having exact change for $1?
What is as big as you are and yet does not weigh anything?
An archaeologist unearths a coin bearing the inscription "57BC". How does he instantly know that it's a forgery?
What is it that makes tears without sorrow. And takes its journey to heaven?