(Because stick figures are just too complicated.)
A: Can God create a rock so heavy that He can't lift it?
B: Of course. God is omnipotent.
A: But wouldn't the existence of that rock negate God's omnipotence?
B: No, because the physical qualities of a finite object are negligible to an infinite being. Any relationship between the infinite and the finite must be defined by the infinite.
B: The rock would be too heavy to lift due to an act of Divine decree -- God would define it as too heavy to lift and would then use that definition when interacting with it.
A: So if it were a boxing match he'd throw the fight?
B: Why not? Who's going to disbar God?