A briefcase is opened and shown to be empty. It's then closed, turned upside down, opened again and a bowling ball drops out of the case.

ALTERNATIVE EFFECT

A briefcase is placed on a table and shown to be empty. A bowling ball or a bowl of live goldfish can then be produced from the case.

Great for stage or parlor
Perform as a opener or anytime during your act
Other objects can be in the case prior to production.
Produce a bowling ball, goldfish bowl, tennis balls, possibilities are endless