Someone taught this to me a few months ago. I haven't seen it discussed much, so I thought I'd post it for all you dagger users out there.
Most dagger users know Extended Lunge by now.
Direction Key -> Direction Key + Lunge
(It helps if you rebind special attack to the keyboard.)
You can actually add a stab to it.
Direction Key + Stab -> Direction Key + Lunge
Replay
Tip: Against a blocking sword/kodachi user, try looking straight down and doing this combo (backwards lunge). The stab may or may not give the person a massive, but the lunge will hit for sure. It is extremely hard to counter this move.