In Genesis 26:8, we're told, "When [Issac] had been there a long time, Abimelech king of the Philistines
looked out of a window and saw Isaac laughing with Rebekah his wife" (ESV). The translation footnote says, "Hebrew may suggest an intimate relationship."
Wanting to know more, and following the instruction of Dr. Heiser in the "Learning to Use Hebrew" DVD, here's my study on the word, "to laugh" or SAHEQ.
http://livingthebiblios.blogspot.com/2010/06/word-study-example-using-logos-learn-to.html