I like to say something

Body Contact: hand/fingers-to-body, (hand, arm, shoulder, leg)
Hand Shape: curved hand
Movement: rapid tapping motions
Intensity of Movement: heavy
Speed of Movement: fast
Frequency of Movement: repeated
Duration: wait until reaction
Body Orientation: free
Body Posture: free
Body Position Levels: free
Other: Intensity and speed denote urgency. Requires immediate response.