You may want to joke about some people to be funny. Just be sure the truth is on the inside and at the end of what your say. Read: Proverbs 25:18 (click on the link below and read today’s Scripture).
http://bibleresources.bible.com/passagesearchresults2.php?tp=31&book_id=24&c=25&passage1=Proverbs+25%3A18&version1=51