Sylas Visual Bug
As shown in the video (sorry about the doubled chat lines, rewound the replay to make sure I got the whole thing, and it repeated the chat), killing an opponent with a stolen Lux ult shows that Sylas is Lux in chat.
Not game-breaking by any means, but mildly confusing. I would assume it has something to do with the callouts being bound to the skill used, meaning it assumes that, since the ultimate was Lux's, that Lux got the kill, and thus replaced (Sylas) with (Lux).
Amusing, to say the least. :D