Do you think he cleaned your driveway thinking it was his because he was completely crap faced, just got in a fight with the wife about being crap faced again, and took to the drive as an excuse to get away from her for 5 lousy minutes, only to work through the snow and realize he just hit the wrong drive, then went inside and used the fact that he was a good guy, and look what he just did for a neighbor for nothing, as an argument to tell her to go eff herself that he isn't a monster or anything, and that it was just a few beers and that she needs to lay the hell off and quit talking to her sister so much?
Also, if you gave him the cash, she would have just gotten half of it.