Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is an hundred years old? and shall Sarah, that is ninety years old, bear? – Genesis 17:17
What are you believing for that would make them fall over with laughter?
Your parents, your friends, your community…something that is so ridiculously outrageous and so far outside of their experiences that they just laugh.
But bigger than that, what has God shown you that has made you fall over with laughter?
That thing which makes you just laugh when you imagine yourself doing it.
Do that.