So I was fooling around in training mode and discovered something neat...and somewhat practical. I guess you could say it's a mixup from the ledge.
You know how sometimes, when you try to upB shark from under the stage, if you're too close to the edge when you start the upB, our upB will go for the edge but NOT tether to it (the 'failed tether' if you will) so as a result we neither shark with our upB nor do we tether to the edge? (Happens a lot when trying to shark through BF)
Well, we can abuse this...kinda.
You know how when you go to BF/SV and you drop off the ledge, and jump into the bottom of the edge's slope, you will slide up the slope and grab the edge again? (Olis do this while uair planking)
Well, if you jump into the bottom of a slope with a boost jump (jump + upB) and you time it right (not hard to do at all), you slide all the way up and past the slope and land on the stage (and it puts you BARELY above the stage). Sounds lame I know, but try it out for yourself and you'll see just how close ZSS stays to the ground, so it's not as easy to punish this landing as it is punish, say, a ledge drop --> jump onto the stage.
When done on BF it also puts you in the perfect position to downB towards the centre and cancel the kick on the lower platform.