A primitive filmmaker who can usually be counted on for moments of genius, Mel Brooks runs true to form in a comedy about a greedy billionaire (played by Brooks) who bets another tycoon that he can spend a month with the Los Angeles homeless without any of his usual resources and survive. The movie takes a while to hit its stride, and its conclusion is fairly slapdash, but somewhere in between are some of the funniest bits of low slapstick Brooks has ever come up with, and an overall uncloying sweetness helps to save much of the rest. Coscripted by Rudy De Luca, Steve Haberman, and Ron Clark; with Lesley Ann Warren (in an unconventional turn as a bag lady), Jeffrey Tambor, Stuart Pankin, Howard Morris, and De Luca, who’s especially funny. (JR)