Why is there a fatwa against David Letterman?

A fatwa was issued against David Letterman in 2009 by an Indian cleric due to a segment on his show where he made jokes about Sarah Palin and her daughter, referencing a fictional rape. The cleric deemed the jokes disrespectful to Islam and called for action against Letterman. The fatwa sparked discussions about freedom of speech and the limits of humor, particularly in relation to cultural sensitivities.