JFK Jr., Robert F. Kennedy Jr., talks "funny" because he has a rare neurological condition called spasmodic dysphonia. This disorder causes involuntary spasms in the muscles that control vocal cords, leading to his voice sounding shaky, strained, raspy, or strangled. The condition affects how he produces speech, making his voice sound distinctive and sometimes difficult to understand. He has had spasmodic dysphonia since his early 40s, and although there are treatments, it is a chronic condition that impacts about 50,000 people in North America.