Wolf's introduction. After the Downer Beginning, this line really blindsides everyone:
The wolf cub did not at all understand what was going on.
The frozen lemming. That is all.
Spirit Walker
In Spirit Walker, Renn's Epic Fail at wolf talk. Basically, My Hovercraft Is Full of Eels Wolf gets so confused that he starts running around in circles. Seriously.
When Wolf and Renn go to the beach, Wolf learns about fulmar spit the hard way.