Flash + Cait ult.
You can catch a cait ult mid flash if you time it right. My buddy was playing thresh, running beside me, cait sets up her ult, which would easily have killed me,she fires, and he flashes from one side of me to the other, a good 100 units from ending his flash in between me and cait, and as i sit there thinking, holy crap, my buddy's an idiot, he just wasted his flash... He took the bullet mid flash. Since flash can be used to flash through a skillshot without being hit by it, i'm assuming this is probably something that should be worked on. Wasn't just lag on my part, judging by the "wut" from cait and my buddy's pure surprise.