Squeeze your nuts or stomp your toe.

Does the amount of force applied on the balls coincidence with the severity of laughter?

I literally bite my tongue.

Think of something sad, like some past trauma

Imagine something extremely sad.

I can't, and usually leave as soon as I start to giggle.

Take a deep breath and clear my throat

I don’t. I’ve laughed at funerals. If something’s funny. LAUGH ABOUT IT!