Beyond the formal greeting, which may involve a verbal acknowledgment and sometimes a hand shake, facial expression, gestures, body language, and eye contact can all signal what type of greeting is expected. Gestures are the most obvious signal, for instance greeting someone with open arms is generally a sign that a hug is expected. However, crossing arms can be interpreted as a sign of hostility. Facial expression, body language and eye contact reflect emotions and interest level. A frown, slouching and lowered eye contact suggests disinterest, while smiling and an exuberant attitude is a sign of welcome.