Immovable Object (a skill for a future champion)
What happens when you have an Unstoppable Force that collides with an Immovable Object? I don't know, but it'd be pretty funny to watch that balancing nightmare play out.
Not exactly sure what this skill would be useful for, other than it being used by a tank(or some support anti-crowd CC ultimate with the longest cooldown in history).
As an April Fools joke, if Immovable Object and Unstoppable Force meet, both the Malphite and the champion with Immovable Object should be CTD'd.
That's all I have, I'm sure something like this has been suggested before, but I just wanted to chime in with my 2 cents. :)