Possible Bug Explanations?

We all know that game bugs happen; it's unavoidable to have completely bug-free code. However, not all bugs are created equal. Some are minor typos, some are game crippling monsters, while yet others are just hilarious. As a software developer, I actually enjoying seeing the bug fix reports and trying to figure out how such bugs could have happened.

The vast majority of them are easily explainable; such as Garen's Decisive Strike not working properly against structures. But then there are ones like.... well..... I'm sure people remember Viktor disabling Annie's ultimate. That one still has me baffled.

So to finally get to the point, I'm wondering if any Rioters would be able to share some anecdotes, funny or otherwise, on how some of their more "unique" bugs happen from a technical standpoint. I understand completely if there are issues with revealing code or the structure of the game itself; so let me know if that's the case.

On a separate note, a story-oriented explanation of some of them could be amazing. (Zed can't return to his shadow after GA procs) "After gazing briefly into the tunnel of light, Zed begins to question his life decision. Ivory wings raise him from the dead, nearly whole. Except.... with his revelation of light.... the bladed ninja has lost his connection to the shadows. Never again can he return to his umbral duplicate."