I remember that flick too. My favorite scene is where Junior cranks up the Crazy Dance ride to the highest speed, and everybody on the ride, even almost the whole carnival heaves their guts out.
Another great scene is where Junior tries to threaten Lawanda by putting roaches from his roach motel into the salad. Big trouble ambushes the Healy dinner table, thanks to Junior.
Also, Junior sets up a few gags on Lawanda. First, he rearranges the blood samples by placing the rabid blood sample under Lawanda's name, then after Lawanda was caught as a rabies victim (whipped cream thought as foaming of the mouth), she was restrained to the bed, then Junior places the nose job form under Lawanda's name, then her nose was elongated and she shouted "I'M PINOCCHIO!"