What the Bible says about Joking
(From Forerunner Commentary)
Foolishness is never a joke when deceit is involved. A person who does such things is as insane as a person who randomly shoots into a crowd. His actions may have serious consequences, even death, though it is not his intention. God considers it no excuse to say, "I didn't mean it."
John W. Ritenbaugh
The Ninth Commandment (1997)