One of the worst things to put in a kitchen. Main problem is if the house has old cast iron or galvanized pipes for drain lines there is very little you can put down the disposal and unfortunately people think they are garbage cans and they can throw anything down them. Things you should not put down a disposal include: potato peels, carrot peels, celery, avocado's, orange peels, Banana peels, onions, artichokes, asparagus, lettuce, cabbage, corn husks, egg shells, meat with fat, rice, pasta, beans, cigarette butts, plant clippings, twist ties, chop sticks, etc. As you can see from the list there isn't much you can put down a disposal. Some of the worst clogs I have had to clean out of traps were rice, pasta, egg shells and potato peels and lets not even talk about meat scraps!