You MUST check out Dr. Smith's ECG Blog. He is the guru genius of ecg's in our field and if you want to impress your attending, or better yet outwit the cocky cardio fellows then you gotta follow Dr. Smith's blog.
Here is a great example of a case he presents weekly. Also, as a side I had a fairly similar case in real life and may have missed the finding (very bad). It was a bit more subtle in my case.
What is wrong with this cardiogram? The patient has a known RBBB.
HERE is the case, and the answer.