Brewster's Millions (1985)

Moral: Money can't buy true friends.

Richard Pryor stars as a minor league baseball player who is willed an enormous inheritance. There are two stipulations; in order for him to collect 300 million, he has to spend 30 million in 30 days and have nothing to show for it (why don't I have problems like this?). Pryor also can't let anyone know why he's spending his money so frivolously. The situation turns Pryor into a media celebrity with more fair-weather friends than a pot dealer at a Phish concert.