that is kinda' an easy one for me. I laugh hysterically with horrible events. An example. My dad tries to light a propane torch. He plays with knob. Tries again, but looks closely at it while doing it. It erupts in flames, so he tosses it. It lights the trash can on fire. I put out the fire. I look at dad, dad looks at me, I laugh hysterically to the point my head hurts. It is the back of my head that hurts too. Not a funny thing, it is a nervous reaction, they have a fancy name for it too. I only bust a gut after the heroics of the event. Like catching a friend slipping on a gable roof and pulling to safety. He got mad at me, but I just do it.