What is the difference between Abraham's and Sarah's laugh after the LORD's promise?

In the bible we can see two events, In Genesis the LORD promised Abraham and Sarah a son, but we can see they both laughed. case 1: Abraham fell facedown; he laughed and said to himself, "Will a son be born to a man a hundred years old? Will Sarah bear a child at the age of ninety?" -Genesis 17:17 Case 2: Sarah laughed to herself,-Genesis 18:12 The LORD doesn't get angry'?' as Abraham fell facedown and laughed while Sarah laughed to herself. Is the anger'?' of LORD because of Sarah's lie that She didn't laugh? NB: '?' is used just because I'm not sure if it's real anger.