Down air Stall

Toon Link's D-Air Glitch

How to perform
Using Toon Link's Down Aerial repeatedly after being thrown or otherwise launched into the air will eventually cause him to perform a small hop, then float in the air for a short time with his sword don in the normal position for his D-Air.

Usefullness
It can be used to both negate repeated vertical knockback as well as for recovery purposes because of its extra jump as well as negating much momentum and the ability to control its trajectory.