Possible Clues:

• Slippery slapstick prop
• Crazy family a possible source of embarrassment
• Potential source of a slip-up
• The yellow slipper will get you down
• Pratfall cause
• Crazy family that's dangerous when one puts one's foot down
• Stereotypical pratfall cause
• Ice cream seller eating fool, food wrapper discarded
• Slipper?
• Upon which one slips out to lunch with family