It was hilarious (of course). Unfortunately, it doesn't appear to be on Youtube (except a 3-min. clip that doesn't include the dirt-eating. Pinky and Brain wander into an American frontier village. Brain, who has decided to become a combination of many American folk heroes, calls himself Big Johnny Brain Jones Peach Pit Bill Boone Crockett, tries to sell peach pits to the villagers. They tell him they only eat dirt (which they pronounce as "doyt"). Brain says, "But wouldn't you rather eat fresh peaches?" A villager answers, "What's wrong with eat'n doyt? My grandpappy lived to the ripe old age of 17 eat'n noth'n but doyt!" Meanwhile, the locals cram handfuls of dirt into their mouths.
Okay, it's sort of weird that I actually remember all of this.