Aleri _xv from SRk forums found this good vid on youtube.This is one damn good trick i was not aware of!
source: SRK forum
Update: According to eventhubs.com this neat trick is not FADC! it is actually an EX move with super armor that get's cnacelled into an ultra. Gotta go try this now!
Special thanx to FistfulOawesome for pointing that out!