Sticky foods: caramel, Skittles, Starbursts, toffee candies, gummy bears
Hard & Crunchy foods: hard candies, ice, nuts, lollipops, chips, popcorn
Staining foods: red wine, dishes with several spices
You also need to cut foods that require biting into small pieces, like apples, hard crusty bread, meat, corn on the cob, and carrots.