After he drinks a few of them, he slams the glass on the bar and asks the bartender who the toughest guy in the bar is. The bartender told him it was the big muscular guy at the end of the bar.
The midget asks for another shot, slams it down, then walks over to the big guy and starts to beat the shit out of him. After beating the guy up, the midget gets another shot, pays his bill and leaves.
This happens for a few nights in a row, always with the same result: the midget getting drunk and then beating the shit out of the toughest guy at the bar.
Finally the owner tells the bartender they have to do something, even though the midget is buying a lot of drinks, he's driving customers away. So the bartender says he has a friend at the zoo who takes care of a big gorilla and that they could bring him in one night.
So the next night they bring in the gorilla and put him in the bathroom.
Not long after, the midget appears again. He has his drinks and then asks the bartender who the toughest guy in the bar is. The bartender tells the midget that the toughest guy is in the bathroom. Hearing that, the midget finishes off his shot and goes into the bathroom.
They hear a lot of loud noises, thuds, screams, grunts, and walls getting smashed. Suddenly it gets quiet. Then the door opens and the midget walks out, looks at the bartender and says: "When Michelle Obama wakes up, tell her she'll find her fur coat in the trash can!"