Ali Baba and the Forty Thieves

The original get-rich-quick scheme... if you don't get caught. 

You are cousins of Ali Baba. After he becomes  rich, you keep pestering him until he tells you his secret - the hidden cave of the forty thieves. Now it is your turn to visit the cave and make yourselves rich too! Take as much as you can, but beware - you lose your sense of time in the cave. The thieves return at 12 midnight. If you hear them coming, drop everything and run for your lives!