This
trick is hard, and don't hit yourself in the head!
1.
Throw
a foward pass.
2.
As
the yo-yo comes back, don't catch it...
3.
...fling
the yo-yo straight up in the air.
4.
Now
as the yo-yo comes back down...
5.
...fling
the yo-yo into another foward pass.
6.
Catch
it. You can repeat it many times.