Some movie premises just won't work, no matter what you do. 1988's Hot To Trot is one such film—it's a movie starring a talking horse and Bobcat Goldthwait, and you legitimately can't tell who's more annoying.
There's actually a plot to this movie, kind of. Goldthwait works in the family stock business with his evil stepfather. His late mother wills him Don, a horse who can talk, but apparently only to Goldthwait. Evil stepdad wants to buy out Goldthwait's share of the company, but Bobcat refuses. Finally, they enter a winner-take-all horse race, pitting Goldthwait's talking horse versus Evil Stepdad's entire stable of horses (this, naturally, includes a horse Don's got a thing for). Of course, Goldthwait is the jockey, despite having no jockey experience whatsoever. Also of course, he wins, because what's the point of a talking-horse movie if everyone watching leaves the theater with long faces?
For reasons known only to him, Burgess "The Penguin" Meredith agreed to appear in this film. You don't see him, however, because he's voicing a housefly. He's Goldthwait's father, see, reincarnated as a fly. Sad as that may be, it was probably less embarrassing for Meredith than actually appearing on camera.