Griswold's Christmas Bonus

I was watching National Lampoon's Christmas Vacation the other day. Good flick, but the ending peeves me, due to his views on his Christmas bonus. He started making all these plans for what he'd spend his bonus on, like a swimming pool, putting down-payments on it, but then his boss stiffs him on the bonus and he goes on a rant about how it's not right to deny people of their bonuses when they rely on them as part of their income.

Doesn't that defeat the entire purpose of a BONUS? You shouldn't factor that in at all, because it absolutely is NOT something you should expect. Yet he's supposed to be the hero because he thinks he's owed this shit? Talk about entitled. Then in the typical American fashion, he complains about it until his boss "sees the error of his ways" and bam. He's the hero? What an asshole.