Coffee grounds don't break down in the garbage disposal; instead, they accumulate and form a dense, pasty sludge that can clog pipes and impede drainage.
Animal bones and seafood shells like shrimp are too hard for a garbage disposal to crush up. Trying to grind these items can break the blades and damage the motor.
When exposed to water, these carbs swell and form a sticky paste that clings to the walls of your pipes. The noodles can also get tangled around disposal blades.