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Despite being warned by Alex (Judd Hirsch) of the evils of gambling, Jim (Christopher Lloyd) becomes fascinated with horse racing -- and betting on the horses being raced. The result: Jim wins a huge amount of money at the track...and also buys a race horse, whom he names "Gary." The fun begins when Jim tries to sneak his new "pet" into his hovel of an apartment, in preparation for setting the nag free in Central Park. But "fun" is hardly the word when the other cabbies make an unexpected visit to Jim's place.