I was speechless when Law proposed an alliance with Luffy in Punk Hazard. And even more so when Luffy said yes!. But now, after seeing the entirety of that conversation, I've gotta say, Luffy is one crazy guy ....but we already knew that haha.
Of course, if he wants to become the Pirate King, it's only natural he'd have to fight the Four Emperors, but Luffy actually seemed pretty excited about it, what's more, he seemed to be looking forward to fight against Shanks!
Law may have intended to use Luffy, but he's now wondering who's using who.