OK. Comments are undisabled. Basically, as those of you who have been following Walter's storyline closely will know, a critical event is that he killed a cop to frame him for the murders of Jessica Roberts (actually killed by Misty) and Adam Martin (whom Walter believed to be killed by Misty but was actually killed by Shauna Shipman).
3x05 depicted Walter talking with Shauna and quite casually referencing that she had killed Adam. As a result, now that Iddy and I have talked, Walter is going to inexorably approach the realization and confirmation of the truth, which will make him very mad because Misty has been lying to him this entire time.