df+RH crossup weirdness
I guess there’s a way to do Chun’s df+RH and have it hit as a crossup on characters that normally are able to block it the same way every time. The key is that they have to get knocked down in such a way that their prone body is sliding towards Chun Li as she’s initiating her df+RH. This gives her just a few extra pixels of distance to land the move on the opposite side.
The characters in the above examples were trying to do a crouching, same-side blocks. In Blanka’s case, the timing of Chun’s df+RH is so strict that I was unable to easily capture one of Blanka’s crouching “switch sides” frames to “prove” that it’s crossing him up. But it still works!
**Setup #1: Limb-smash.** If you do a neckbreaker that lands on an opponent's extended limb, you can smash down on them and have their body fall towards you. If Chun times another neckbreaker correctly, it can hit as a crossup.
http://i235.photobucket.com/albums/ee304/Raisin_SF2/Chun%20Li/NeckbreakercrossupvsGuile.png
Otochun did this no fewer than two times in his 10-game match with Gian, so that suggests that it could be nasty even on expert players. See one example of the [media=youtube]ddGxLGLx5lc[/media] into crossup neckbreaker, 0:33-0:36.
Setup #2: Neckbreaker, jump over. Say you you land a neckbreaker on their head for whatever reason – they messed up trying a reversal, they didn’t know how to block it in the first place, or for whatever reason they just goofed. What you get is them sliding away from you. But you actually have so much time that you can jump over to the opposite side right after you land, and now they’re sliding towards you. A second neckbreaker now has crossup ability.
Check a [media=youtube]jwbppc0f6GE[/media] at 4:33. Otochun goes for a third one, but he didn’t make his jump completely over, ended up holding downback instead of downforward, and got a c.RH instead! 
**Setup #3: Crazy, backwards upkicks.** The gist of this one is that it's possible to land upkicks when the opponent is behind you, i.e. when the opponent is doing a wild crossup. They get knocked out of the air but actually fall towards your body, giving you crossup neckbreaker ability.
From the same match as before, check the [media=youtube]jwbppc0f6GE[/media] at 4:31.
Setup #4: Crossup jumpkick. Another way is just to do a crossup j.MK, so you land on the opposite side and their body is being pushed towards you. If you immediately do a neckbreaker afterwards, they’ll still be sliding underneath you so that your neckbreaker can hit as a crossup. You have to be fast with this follow-up or they won’t slide underneath you far enough.
This setup is not without risk, because your opponent has a fair amount of time before the neckbreaker lands. If they get wise to it or can react in time, they can do something like jump up and hit you out of the air.