NFL.com has a video from Muhammad Ali's visit to the Ravens camp a few years back, and it includes a passionate speech from Jack Harbaugh relating the famous "What's My Name?" story of Ali's fight with Ernie Terrell. Never heard the elder Harbaugh speak before, but after listening to only this clip, almost everything about Jim makes sense. I'm not sure Jim or John could have fallen far from the tree.
[Ali] said to the world this: "What's my name?" It became a battle cry in my family. We would talk to John and Jim and Joanie. RESPECT. That's what we're looking for in this world. So when I tell you this, I humbly say, this man [pointing to Ali], this man right here, is my hero. This man has molded not only myself and my family, but all the teams that I've coached. Every team I've coached has heard the Muhammad Ali story. I love this man.
From a different video of the Harbaugh family roundtable (including a cameo by Tom Crean, for you fans), here's Jim re: the What's My Name legend:
The cool thing is, this is the kind of story we've been hearing since we were kids. We didn't get Little Red Riding Hood or The Little Engine That Could stories.
Yep. That explains a lot.