Lying to a friend to create a joke is not cool, nor is it funny.
Read: Proverbs 26:18-19
“Just as damaging as a madman shooting a deadly weapon is someone who lies to a friend and then says, “I was only joking.”
http://bibleresources.bible.com/passagesearchresults2.php?tp=36&book_id=14&c=32&passage1=Proverbs+26%3A18-19+&version1=51