The inclusion of a humorous character or scene or witty dialogue in an otherwise serious work, often to relieve tension
A humorous or farcical interlude in a serious literary work or drama, especially a tragedy, intended to relieve the dramatic tension or heighten the emotional impact by means of contrast. a British charity organization which was started by professional comedians. Once a year they have a special day when they collect money for people who need help in the UK and other countries