... or sing-song Having trouble making friends Not understanding humor or sarcasm Having unusual behaviors and/or or narrow interests, called "restrictive/repetitive behaviors." For example: Repeating words or phrases (called echolalia), or hand flapping and/or body rocking Having a lasting, intense interest in specific topics, such as numbers, details, or facts Showing unusual attachment to toys, objects Becoming upset by slight changes in a routine and having difficulty changing from one activity to another Being more ...