I have not met too many Christians who take themselves so seriously that they refuse the pull to comedy or laughter. It is more common to meet Christians to take it to the other extreme - those who seek out comedy at the expense of morality. Seeking amusement (literally meaning "without thought") at the expense of right living and holiness.
Yet, holy living does not mean a dour expression, constant weeping, and a wet blanket for every occaion. No! God made us to laugh and enjoy laughter. Who can listen to a baby's belly laugh and not smile? It is because laughter - an emotional response to something that tickles our mind's senses - is a medicine to our soul. It is not the cure, but it is a medicine.
A joyful heart is good medicine,
but a crushed spirit dries up the bones. (Proverbs 17:22)
Mike Jensen writes this brief article on the necessity for laughter in the Christian life. You can access it (5 min. read) by clicking --> here <--
Here's an excerpt:
In an age of anxious individualism, the self becomes a fragile project, endlessly managed and protected. Laughter is dangerous here, because it risks exposure—and so we cling to seriousness instead.