Quirky behaviors are often characterized by TICS, which are sudden, repetitive movements or vocalizations. TICS can range from mild to severe and can be either voluntary or involuntary. They are often associated with conditions such as Tourette Syndrome, but can also occur in people without any underlying medical condition. Quirky behaviors can also include eccentricities, such as unusual dress or mannerisms, that make a person stand out from the crowd.