Ahh, proofreaders... the unsung heroes of the literary world. Reminds me of this:
A guy is standing in a bar having a drink, when this furry creature walks in, orders a sandwich, takes two bites, pulls a gun and shoots out a light, then walks back out. Obviously upset, the man asks "What in the world was that?"
The bartender says, "Oh, that was a panda."
The guy answers back, "No way that was a panda. I'm a wildlife biologist, and I study pandas in the wild. That was not a panda."
The bartender hands him a Dollar Store dictionary and says, "Oh yeah? Look it up for yourself."\
There on page 397 the man read, "panda - medium size furry mammal. Eats, shoots and leaves."