Originally Posted by RamserX
you can also troll pool or zhonya's
These two will not put Darius' ultimate on cooldown.
Darius' ultimate only goes on cooldown if he strikes his target. Banshee's Veil, Spell Shield, Nightmare Shroud, Divine Intervention, Diplomatic Immunity and Undying Rage (and any I missed) are the only ways to "waste" Darius' ultimate and put it on cooldown (short of surviving it, obviously).
I agree with the original point. It should at least break - like Skarner, Cho'Gath, etc. None of those go on cooldown, though.