For me I think about the poor person who would have to find me. They would take it home to family who would in turn look for solace in others who themselves would do so and onward. I figure it would just spiral so hundreds would be affected.

I face the urge head on. If I am at a table, I press my wrists into the edge of the table until it hurts. I use the old trick of ice until that hurts too. I do the opposite with a feather, lightly dragging it back and forth across my wrists - it is very soothing. I have a long beanbag (sock and lentils) that is actually soothing too. Sometimes just the weight of it alone on my chest calms me down, sometimes I thud it agains my neck and chest and that helps me to cope.

I also recommend a "Behavioural Chain Analysis" worksheet to break down the causes and come up with coping strategies.