To avoid crying in an unwanted or inappropriate situation, a sharp but not overly-painful self-administered pinch may distract the body from crying. Drinking a cold beverage while on the verge of weeping may engage facial nerves other than those of the tear ducts.
Crying is a potentially unpleasant physical response to an emotionally distressing situation. By taking deep breaths, crying episodes can sometimes be circumvented. It is well-documented that deep, controlled breathing has a calming effect on the human body; it distracts the mind from whatever emotionally distressing stimulus is present. Finally, walking away from an unpleasant situation can often put off tears; by removing the source of grief, the mind can calm down enough to keep from crying.