Over and over...
One thought keeps going through their head, one sentence keeps being repeated, one activity is done over and over. Getting stuck is one of the early symptoms of HD. A person with HD can become obsessed with something and be unable to switch to another activity or conversation.
When a person is stuck in a mode, they can become irritable if they or their wishes are ignored. A doctor may be able to prescribe a medical treatment.
Care partners report that distraction can be a good strategy. Providing a snack or changing the activity to one of their favorites may get them out of their rut. If it is a frequent thought or phrase, think of the motto, "Nod and smile," and practice patience.