http://www.drmcninja.com/index.html
Q: Who is Dr. McNinja?
A: Dr. McNinja is a doctor who is also a ninja.
Q: That's a pretty kooky name, Dr. McNinja. How'd you come up with that?
A: Well, way back in 2003, it was originally just my Something Awful forums name, and it was really close to being Dr. McNuggets. (I had a bit of a thing for them back then. I also like claiming to be a doctor.) But last second before registering, I realized I could kick up the awesome a pretty decent amount by changing the"Nuggets" to "Ninja."

"Why don't you zip it, Zipfero?" - fraich3