Difficulty: 1 - Basic Juggling
Siteswap: 42 or (4,2)
Prerequisite Skills: 2-in-one-hand, Fake Columns
Watch Video - WMV - 0.5 MB

Yo-Yo is just a funny little variation of the Fake Columns pattern. It's an easy to perform crowd pleaser (more bang for your buck).
Instructions:
If you can perform fake columns, then this one will be easy. Just lead one of the balls of your 2-in-one-hand with the held ball. Try to make your hand move in the exact manner and timing of the thrown ball. Make it look like you are pulling the thrown ball up with an invisible string.
Variations:

Oy-Oy - This is the "opposite" of Yo-Yo.
Watch Video - WMV - 0.3 MB